diff --git a/.gitignore b/.gitignore
index dc3cb4d..8e6f4dd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ build/
 /*.js
 input.txt
 node_modules
+mkday.py
diff --git a/aoc2023/Aoc.newt b/aoc2023/Aoc.newt
index 8ab948b..7cd501d 100644
--- a/aoc2023/Aoc.newt
+++ b/aoc2023/Aoc.newt
@@ -29,3 +29,19 @@ indexOf? {a} z xs = go Z z xs
     go ix z Nil = Nothing
     go ix z (x :: xs) =
       if z == x then Just ix else go (S ix) z xs
+
+-- TODO move to Aoc library
+Point : U
+Point = Int × Int
+
+instance Add Point where
+  (a,b) + (c,d) = (a + c, b + d)
+
+instance Sub Point where
+  (a,b) - (c,d) = (a - c, b - d)
+
+instance Ord Point where
+  (a,b) < (c,d) = a < c || a == c && b < d
+
+instance Eq Point where
+  (a,b) == (c,d) = a == c && b == d
diff --git a/aoc2024/Day10.newt b/aoc2024/Day10.newt
index fc57034..d3d1d3b 100644
--- a/aoc2024/Day10.newt
+++ b/aoc2024/Day10.newt
@@ -16,21 +16,6 @@ gridPoints text = go 0 0 (unpack text) Nil
     go row col ('\n' :: cs) points = go (row + 1) 0 cs points
     go row col (c :: cs) points = go row (col + 1) cs ((c,row,col) :: points)
 
-Point : U
-Point = Int × Int
-
-instance Add Point where
-  (a,b) + (c,d) = (a + c, b + d)
-
-instance Sub Point where
-  (a,b) - (c,d) = (a - c, b - d)
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
 -- TODO add parameter a and pass Char -> a into getGrid
 Grid : U
 Grid = SortedMap Point Int
@@ -59,12 +44,6 @@ paths grid pts ht =
     getCands : Point → List (Point × Int)
     getCands pt = mapMaybe (\ p => lookupMap p grid) (peers pt)
 
-foldMap : ∀ a b. {{Ord a}} {{Eq a}} → (b → b → b) → SortedMap a b → List (a × b) → SortedMap a b
-foldMap f m Nil = m
-foldMap f m ((a,b) :: xs) = case lookupMap a m of
-  Nothing => foldMap f (updateMap a b m) xs
-  Just (_, b') => foldMap f (updateMap a (f b' b) m) xs
-
 paths2 : Grid → List (Point × Int) → Int → Int
 paths2 grid pts ht =
   if ht == 9 then foldl _+_ 0 $ map snd $ pts else
diff --git a/aoc2024/Day11.newt b/aoc2024/Day11.newt
index 4277be2..e0a29bc 100644
--- a/aoc2024/Day11.newt
+++ b/aoc2024/Day11.newt
@@ -14,12 +14,6 @@ pfunc divide uses (_,_) : String → String × String := `(s) => {
   return _$2C_(undefined, undefined, s.slice(0,l), s.slice(l))
 }`
 
-foldMap : ∀ a b. {{Ord a}} {{Eq a}} → (b → b → b) → SortedMap a b → List (a × b) → SortedMap a b
-foldMap f m Nil = m
-foldMap f m ((a,b) :: xs) = case lookupMap a m of
-  Nothing => foldMap f (updateMap a b m) xs
-  Just (_, b') => foldMap f (updateMap a (f b' b) m) xs
-
 step : List (Int × Int) → List (Int × Int)
 step = go Nil
   where
diff --git a/aoc2024/Day11b.newt b/aoc2024/Day11b.newt
index a5be114..87dc34c 100644
--- a/aoc2024/Day11b.newt
+++ b/aoc2024/Day11b.newt
@@ -22,12 +22,6 @@ stone num = if num == 0 then Left 1 else go num num 1
       else if b < 10 then Left (2024 * num)
       else go (div53 a 10) (div53 b 100) (mod * 10)
 
-foldMap : ∀ a b. {{Ord a}} {{Eq a}} → (b → b → b) → SortedMap a b → List (a × b) → SortedMap a b
-foldMap f m Nil = m
-foldMap f m ((a,b) :: xs) = case lookupMap a m of
-  Nothing => foldMap f (updateMap a b m) xs
-  Just (_, b') => foldMap f (updateMap a (f b' b) m) xs
-
 step : List (Int × Int) → List (Int × Int)
 step xs = go Nil xs
   where
diff --git a/aoc2024/Day12.newt b/aoc2024/Day12.newt
index 9982abb..d3d8acb 100644
--- a/aoc2024/Day12.newt
+++ b/aoc2024/Day12.newt
@@ -16,21 +16,6 @@ gridPoints text = go 0 0 (unpack text) Nil
     go row col ('\n' :: cs) points = go (row + 1) 0 cs points
     go row col (c :: cs) points = go row (col + 1) cs ((c,row,col) :: points)
 
-Point : U
-Point = Int × Int
-
-instance Add Point where
-  (a,b) + (c,d) = (a + c, b + d)
-
-instance Sub Point where
-  (a,b) - (c,d) = (a - c, b - d)
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
 -- TODO add parameter a and pass Char -> a into getGrid
 Grid : U
 Grid = SortedMap Point Int
diff --git a/aoc2024/Day13.newt b/aoc2024/Day13.newt
index 0702ade..e0adae9 100644
--- a/aoc2024/Day13.newt
+++ b/aoc2024/Day13.newt
@@ -5,27 +5,6 @@ import Node
 import Aoc
 import Parser
 
-
-Point : U
-Point = Int × Int
-
-instance Add Point where
-  (a,b) + (c,d) = (a + c, b + d)
-
-instance Sub Point where
-  (a,b) - (c,d) = (a - c, b - d)
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
-
-token : String → Parser Unit
-token str = string str >> ws
-
-
 data Machine : U where
   MkMachine : Point → Point → Point → Machine
 
diff --git a/aoc2024/Day14.newt b/aoc2024/Day14.newt
new file mode 100644
index 0000000..b0f4717
--- /dev/null
+++ b/aoc2024/Day14.newt
@@ -0,0 +1,156 @@
+module Day14
+
+import Prelude
+import Node
+import Aoc
+import Parser
+import SortedMap
+
+data Robot : U where
+  MkBot : Point → Point → Robot
+
+pint : Parser Int
+pint = do
+  sign <- pure (0 - 1) <* match '-' <|> pure 1
+  num <- number
+  pure $ sign * num
+
+ppoint : Parser Point
+ppoint = _,_ <$> pint <* match ',' <*> pint
+
+probot : Parser Robot
+probot = do
+  token "p="
+  p <- ppoint
+  ws
+  token "v="
+  v <- ppoint
+  ws
+  many (match '\n')
+  pure $ MkBot p v
+
+-- TODO make Mod typeclass or something
+infixl 7 _%_
+pfunc _%_ : Int → Int → Int := `(x,y) => x % y`
+
+pmod : Int → Int → Int
+pmod a b =
+  if a < 0 then (a + b * ((0 - a / b) + 1)) % b else a % b
+
+move : Int → Int → Int → Robot → Point
+move w h time (MkBot (x,y) (dx,dy)) =
+  -- no HMul yet
+  -- let (x',y') = trace "to" $ (x,y) + (time * dx, time * dy) in
+  let x' = pmod (x + time * dx) w
+      y' = pmod (y + time * dy) h
+   in (x', y')
+
+count : ∀ a. (a → Bool) → List a → Int
+count {a} f xs = go xs 0
+  where
+    go : List a → Int → Int
+    go Nil acc = acc
+    go (x :: xs) acc = if f x then go xs (acc + 1) else go xs acc
+
+draw' : Int → Int → SortedMap Point Int → IO Unit
+draw' w h pts = go 0
+  where
+    mkLine : Int → Int → SnocList Char → String
+    mkLine y x acc = if x == w then pack (acc <>> Nil)
+      else case lookupMap (x,y) pts of
+        Nothing => mkLine y (x + 1) (acc :< '.')
+        _       => mkLine y (x + 1) (acc :< '*')
+
+    go : Int → IO Unit
+    go y = if y == h then pure MkUnit else do
+      putStrLn $ mkLine y 0 Lin
+      go (y + 1)
+
+draw : Int → Int → List Point → IO Unit
+draw w h pts =
+  let m = foldMap _+_ EmptyMap $ map (flip _,_ 1) pts in draw' w h m
+
+
+part2 : Int → Int → List Robot → List Point × Int
+part2 w h robots = go 1
+  where
+    heuristic : Point → Bool
+    heuristic (x,y) = if x < w / 2 then 100 < 2 * x + y else 2 * (x - 50) < y
+    -- heuristic (x,y) = x == w / 2
+    go : Int → List Point × Int
+    go t =
+      let pts = map (move w h t) robots
+          cnt = count heuristic pts
+      in if cnt > 20 then (pts, t)
+      else go (t + 1)
+
+run : String → Int → Int → IO Unit
+run fn w h = do
+  putStrLn fn
+  text <- readFile fn
+  let (Right (robots, Nil)) = some probot $ unpack text
+    | Left msg => putStrLn $ "Parse Error " ++ msg
+    | Right (robots, rest) => putStrLn $ "stuck at¬" ++ pack rest
+  let result = map (move w h 100) robots
+  -- debugLog result
+  let q1 = count quad1 result
+  let q2 = count quad2 result
+  let q3 = count quad3 result
+  let q4 = count quad4 result
+  debugLog (q1,q2,q3,q4)
+  let p1 = q1 * q2 * q3 * q4
+  putStrLn $ "part1 " ++ show p1
+  printLn $ count (\ x => True) robots
+  let scores = collect robots 0 Nil
+  let stuff = qsort (\ a b => snd a < snd b) $ collect robots 0 Nil
+  -- debugLog stuff
+  dump robots stuff 1
+  where
+    dump : List Robot → List (Int × Int) → Int → IO Unit
+    dump robots Nil _ = pure MkUnit
+    dump robots (((t,cnt) :: xs)) 0 = pure MkUnit
+    dump robots (((t,cnt) :: xs)) gas = do
+      printLn t
+      draw w h $ map (move w h t) robots
+      printLn ""
+      dump robots xs (gas - 1)
+
+    quad1 : Point → Bool
+    quad1 (x,y) = x < w / 2 && y < h / 2
+
+    quad2 : Point → Bool
+    quad2 (x,y) = x > w / 2 && y < h / 2
+
+    quad3 : Point → Bool
+    quad3 (x,y) = x > w / 2 && y > h / 2
+
+    quad4 : Point → Bool
+    quad4 (x,y) = x < w / 2 && y > h / 2
+
+    heuristic : Point → Bool
+    heuristic (x,y) = if x < w / 2  then 100 - 2 * x < y else 2 * x - 100 < y
+
+    dist : Point → Int
+    dist (x,y) = let d = if x < w / 2 then y - (h - 2 * x) else y - (h - 2 * (w - x)) in
+      if d < 0 then 0 - d else d
+
+    collect : List Robot → Int → List (Int × Int) → List (Int × Int)
+    collect robots iter acc =
+      if iter > w * h then acc else
+      let pts = map (move w h iter) robots in
+
+      -- This heuristic found it, attempting to find an outline of a large tree
+      -- but the picture looks nothing like that, so I got lucky
+      -- let cnt = foldl _+_ 0 $ map dist pts in
+      -- so I'll go with min danger (although it takes 4 * as long)
+      let q1 = count quad1 pts
+          q2 = count quad2 pts
+          q3 = count quad3 pts
+          q4 = count quad4 pts
+          cnt = q1 * q2 * q3 * q4 in
+      collect robots (iter + 1) ((iter,cnt) :: acc)
+
+main : IO Unit
+main = do
+  -- run "aoc2024/day14/eg.txt" 11 7
+  run "aoc2024/day14/input.txt" 101 103
diff --git a/aoc2024/Day6.newt b/aoc2024/Day6.newt
index c0bbd38..797cabc 100644
--- a/aoc2024/Day6.newt
+++ b/aoc2024/Day6.newt
@@ -5,15 +5,6 @@ import Node
 import Aoc
 import SortedMap
 
-Point : U
-Point = Int × Int
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
 Grid : U
 Grid = SortedMap Point Char
 
diff --git a/aoc2024/Day8.newt b/aoc2024/Day8.newt
index 6215b12..415f771 100644
--- a/aoc2024/Day8.newt
+++ b/aoc2024/Day8.newt
@@ -5,15 +5,6 @@ import Node
 import Aoc
 import SortedMap
 
-Point : U
-Point = Int × Int
-
-instance Add Point where
-  (a,b) + (c,d) = (a + c, b + d)
-
-instance Sub Point where
-  (a,b) - (c,d) = (a - c, b - d)
-
 Ant : U
 Ant = Char × Int × Int
 
@@ -59,12 +50,6 @@ doGroup2 : Int -> List Ant -> List Point
 doGroup2 m (x :: xs) = join $ doGroup2 m xs ::  map (doPair2 m (snd x) ∘ snd) xs
 doGroup2 m Nil = Nil
 
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
 run : String -> IO Unit
 run fn = do
   putStrLn fn
diff --git a/aoc2024/Parser.newt b/aoc2024/Parser.newt
index 8b73092..9ea8b51 100644
--- a/aoc2024/Parser.newt
+++ b/aoc2024/Parser.newt
@@ -65,5 +65,11 @@ number = stringToInt ∘ pack <$> some (satisfy isDigit)
   -- digs <- some (satisfy isDigit)
   -- pure $ stringToInt $ pack digs
 
+optional : ∀ a. Parser a → Parser (Maybe a)
+optional pa = Just <$> pa <|> pure Nothing
+
 ws : Parser Unit
 ws = many (match ' ') >> pure MkUnit
+
+token : String → Parser Unit
+token str = string str >> ws
diff --git a/aoc2024/SortedMap.newt b/aoc2024/SortedMap.newt
index 264131d..ae7fea6 100644
--- a/aoc2024/SortedMap.newt
+++ b/aoc2024/SortedMap.newt
@@ -187,3 +187,9 @@ toList {k} {v} (MapOf smap) = reverse $ go smap Nil
     go (Node2 t1 k1 t2) acc = go t2 (go t1 acc)
     go (Node3 t1 k1 t2 k2 t3) acc = go t3 $ go t2 $ go t1 acc
 toList _ = Nil
+
+foldMap : ∀ a b. {{Ord a}} {{Eq a}} → (b → b → b) → SortedMap a b → List (a × b) → SortedMap a b
+foldMap f m Nil = m
+foldMap f m ((a,b) :: xs) = case lookupMap a m of
+  Nothing => foldMap f (updateMap a b m) xs
+  Just (_, b') => foldMap f (updateMap a (f b' b) m) xs
diff --git a/aoc2024/day14/eg.txt b/aoc2024/day14/eg.txt
new file mode 100644
index 0000000..72a324a
--- /dev/null
+++ b/aoc2024/day14/eg.txt
@@ -0,0 +1,12 @@
+p=0,4 v=3,-3
+p=6,3 v=-1,-3
+p=10,3 v=-1,2
+p=2,0 v=2,-1
+p=0,0 v=1,3
+p=3,0 v=-2,-2
+p=7,6 v=-1,-3
+p=3,0 v=-1,-2
+p=9,3 v=2,3
+p=7,3 v=-1,2
+p=2,4 v=2,-3
+p=9,5 v=-3,-3
\ No newline at end of file
diff --git a/newt/Prelude.newt b/newt/Prelude.newt
index 75facd2..bc63b98 100644
--- a/newt/Prelude.newt
+++ b/newt/Prelude.newt
@@ -675,7 +675,7 @@ tail (x :: xs) = xs
 
 --
 
-infixl 6 _<_ _<=_
+infixl 6 _<_ _<=_ _>_
 class Ord a where
   -- isEq : Eq a
   _<_ : a → a → Bool
@@ -683,6 +683,8 @@ class Ord a where
 _<=_ : ∀ a. {{Eq a}} {{Ord a}} → a → a → Bool
 a <= b = a == b || a < b
 
+_>_ : ∀ a. {{Ord a}} → a → a → Bool
+a > b = b < a
 
 search : ∀ cl. {{cl}} -> cl
 search {{x}} = x
@@ -743,3 +745,5 @@ instance Show Char where
 
 swap : ∀ a b. a × b → b × a
 swap (a,b) = (b,a)
+
+
diff --git a/playground/samples/aoc2024/Aoc.newt b/playground/samples/aoc2024/Aoc.newt
index 61f3831..cac5bec 120000
--- a/playground/samples/aoc2024/Aoc.newt
+++ b/playground/samples/aoc2024/Aoc.newt
@@ -1 +1 @@
-../../../aoc2023/Aoc.newt
\ No newline at end of file
+../../../aoc2024/Aoc.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day1.newt b/playground/samples/aoc2024/Day1.newt
deleted file mode 100644
index fc4a364..0000000
--- a/playground/samples/aoc2024/Day1.newt
+++ /dev/null
@@ -1,60 +0,0 @@
-module Day1
-
-import Prelude
-import Node
-import Aoc
-
-pairUp : List Int -> List (Int × Int)
-pairUp (a :: b :: rest) = (a,b) :: pairUp rest
-pairUp (a :: rest) = trace "fail" Nil
-pairUp Nil = Nil
-
-dist : (Int × Int) → Int
-dist (a,b) = if a < b then b - a else a - b
-
-part1 : String -> Int
-part1 text =
-  let pairs = pairUp $ join $ map nums $ split text "\n"
-      left  = qsort _<_ $ map fst pairs
-      right = qsort _<_ $ map snd pairs
-      dists = map dist $ zip left right
-  in foldl _+_ 0 dists
-
-
-lookup : ∀ a b. {{Eq a}} → a → List (a × b) → Maybe b
-lookup key Nil = Nothing
-lookup key ((k,v) :: rest) = if k == key then Just v else lookup key rest
-
-
-coalesce : List Int → Int -> List (Int × Int)
-coalesce (a :: b :: rest) cnt =
-  if a == b then coalesce (b :: rest) (cnt + 1) else (a,cnt) :: coalesce (b :: rest) 1
-coalesce (a :: Nil) cnt = (a,cnt) :: Nil
-coalesce Nil cnt = Nil
-
-cross : List (Int × Int) → List (Int × Int) → Int → Int
-cross xs ys acc =
-  let ((a,cnt) :: xs') = xs | Nil => acc in
-  let ((b,cnt') :: ys') = ys | Nil => acc in
-  if a == b then cross xs' ys' (acc + a * cnt * cnt')
-  else if a < b then cross xs' ys acc
-  else cross xs ys' acc
-
-part2 : String → Int
-part2 text =
-  let pairs = pairUp $ join $ map nums $ split text "\n"
-      left  = coalesce (qsort _<_ $ map fst pairs) 1
-      right = coalesce (qsort _<_ $ map snd pairs) 1
-  in cross left right 0
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  putStrLn $ "part1 " ++ show (part1 text)
-  putStrLn $ "part2 " ++ show (part2 text)
-
-main : IO Unit
-main = do
-  run "aoc2024/day1/eg.txt"
-  run "aoc2024/day1/input.txt"
diff --git a/playground/samples/aoc2024/Day1.newt b/playground/samples/aoc2024/Day1.newt
new file mode 120000
index 0000000..984888a
--- /dev/null
+++ b/playground/samples/aoc2024/Day1.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day1.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day10.newt b/playground/samples/aoc2024/Day10.newt
new file mode 120000
index 0000000..8b38a66
--- /dev/null
+++ b/playground/samples/aoc2024/Day10.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day10.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day11.newt b/playground/samples/aoc2024/Day11.newt
new file mode 120000
index 0000000..86589a0
--- /dev/null
+++ b/playground/samples/aoc2024/Day11.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day11.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day11b.newt b/playground/samples/aoc2024/Day11b.newt
new file mode 120000
index 0000000..f9c395f
--- /dev/null
+++ b/playground/samples/aoc2024/Day11b.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day11b.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day12.newt b/playground/samples/aoc2024/Day12.newt
new file mode 120000
index 0000000..da889f7
--- /dev/null
+++ b/playground/samples/aoc2024/Day12.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day12.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day13.newt b/playground/samples/aoc2024/Day13.newt
new file mode 120000
index 0000000..3dab26b
--- /dev/null
+++ b/playground/samples/aoc2024/Day13.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day13.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day14.newt b/playground/samples/aoc2024/Day14.newt
new file mode 120000
index 0000000..1bfd2d0
--- /dev/null
+++ b/playground/samples/aoc2024/Day14.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day14.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day2.newt b/playground/samples/aoc2024/Day2.newt
deleted file mode 100644
index 4c769e9..0000000
--- a/playground/samples/aoc2024/Day2.newt
+++ /dev/null
@@ -1,51 +0,0 @@
-module Day2
-
-import Prelude
-import Node
-import Aoc
-
-decr : List Int → Bool
-decr (x :: y :: _) = y < x
-decr _ = False
-
-diff : Int → Int → Int
-diff x y = if x < y then y - x else x - y
-
-isSafe : Bool → List Int → Bool
-isSafe decr (x :: y :: rest) =
-  let d = diff x y
-      good = 0 < d && d < 4
-      safe = if x < y then not decr && good else decr && good in
-  if safe then isSafe decr (y :: rest) else False
-isSafe _ _ = True
-
-check : List Int → Bool
-check x = isSafe (decr x) x
-
-any : ∀ a. (a → Bool) → List a → Bool
-any f xs = foldl (_||_) False $ map f xs
-
-alts : List Int → List (List Int)
-alts Nil = Nil
-alts (x :: xs) = xs :: map (_::_ x) (alts xs)
-
--- I want lean's #eval here
-
-parse : String → List (List Int)
-parse text = map nums $ split (trim text) "\n"
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let stuff = parse text
-  let good = filter check stuff
-  putStrLn $ "part1 " ++ show (length good)
-  let good = filter (any check ∘ alts) stuff
-  putStrLn $ "part2 " ++ show (length good)
-
-main : IO Unit
-main = do
-  run "aoc2024/day2/eg.txt"
-  run "aoc2024/day2/input.txt"
-
diff --git a/playground/samples/aoc2024/Day2.newt b/playground/samples/aoc2024/Day2.newt
new file mode 120000
index 0000000..fbe220e
--- /dev/null
+++ b/playground/samples/aoc2024/Day2.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day2.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day3.newt b/playground/samples/aoc2024/Day3.newt
deleted file mode 100644
index fd5047b..0000000
--- a/playground/samples/aoc2024/Day3.newt
+++ /dev/null
@@ -1,121 +0,0 @@
-module Day3
-
-import Prelude
-import Node
-import Aoc
-
-Parser : U → U
-Parser a = List Char → Maybe (a × List Char)
-
-instance Monad Parser where
-  pure a = \ cs => Just (a, cs)
-  bind ma mab = \ cs => ma cs >>= uncurry mab
-
-instance Alternative Parser where
-  pa <|> pb = \ cs => case pa cs of
-    Nothing => pb cs
-    res => res
-
-fail : ∀ a. Parser a
-fail = \ cs => Nothing
-
-satisfy : (Char → Bool) → Parser Char
-satisfy pred = λ cs => case cs of
-  Nil => Nothing
-  (c :: cs) => if pred c then Just (c, cs) else Nothing
-
-match : Char → Parser Char
-match d = satisfy (_==_ d)
-
-any : Parser Char
-any = satisfy (λ _ => True)
-
-some many : ∀ a. Parser a → Parser (List a)
-many p = some p <|> pure Nil
-some p = do
-  v <- p
-  vs <- many p
-  pure (v :: vs)
-
-pnum : Parser Int
-pnum = do
-  chars <- many (satisfy isDigit)
-  if S (S (S Z)) < length chars then fail
-    else pure $ stringToInt $ pack chars
-
-data Inst : U where
-  Mult : Int → Int → Inst
-  Do : Inst
-  Dont : Inst
-
-mul : Parser Inst
-mul = do
-  match 'm'
-  match 'u'
-  match 'l'
-  match '('
-  x <- pnum
-  match ','
-  y <- pnum
-  match ')'
-  pure $ Mult x y
-
-pdo : Parser Inst
-pdo = do
-  match 'd'
-  match 'o'
-  match '('
-  match ')'
-  pure Do
-
-pdont : Parser Inst
-pdont = do
-  match 'd'
-  match 'o'
-  match 'n'
-  match '\''
-  match 't'
-  match '('
-  match ')'
-  pure Dont
-
-some' many' : ∀ a. Parser a → Parser (List a)
-many' p = do
-  pure MkUnit
-  some' p <|> (any >> many' p) <|> pure Nil
-
-some' p = do
-  v <- p
-  vs <- many' p
-  pure (v :: vs)
-
-inst : Parser Inst
-inst = mul <|> pdo <|> pdont
-
-pfile : Parser (List Inst)
-pfile = many' inst
-
-value : Inst → Int
-value (Mult x y) = x * y
-value _ = 0
-
-part2 : List Inst → Bool → Int → Int
-part2 Nil _ acc = acc
-part2 (Do :: insts) _ acc = part2 insts True acc
-part2 (Dont :: insts) _ acc = part2 insts False acc
-part2 (_ :: insts) False acc = part2 insts False acc
-part2 (Mult x y :: insts) True acc = part2 insts True (acc + x * y)
-
-run : String → IO Unit
-run fn = do
-  putStrLn fn
-  text <- trim <$> readFile fn
-  let (Just (insts, Nil)) = pfile (unpack text) | _ => putStrLn "parse failed"
-  let part1 = foldl _+_ 0 $ map value insts
-  putStrLn $ "part1 " ++ show part1
-  putStrLn $ "part2 " ++ show (part2 insts True 0)
-
-main : IO Unit
-main = do
-  run "aoc2024/day3/eg.txt"
-  run "aoc2024/day3/input.txt"
diff --git a/playground/samples/aoc2024/Day3.newt b/playground/samples/aoc2024/Day3.newt
new file mode 120000
index 0000000..6aeebee
--- /dev/null
+++ b/playground/samples/aoc2024/Day3.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day3.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day4.newt b/playground/samples/aoc2024/Day4.newt
deleted file mode 100644
index 273d9f9..0000000
--- a/playground/samples/aoc2024/Day4.newt
+++ /dev/null
@@ -1,76 +0,0 @@
-module Day4
-
-import Prelude
-import Node
-import Aoc
-
-data Problem : U where
-  P : Int → String → Problem
-
-get : Problem → Int → Int → Char
-get (P size text) r c =
-  if r < 0 || size <= r then '.'
-  else if c < 0 || size <= c then '.'
-  else sindex text (r * (size + 1) + c)
-
-check : Problem → Int → Int → Int × Int → Int
-check prob r c (dr,dc) =
-  if (get prob r c) /= 'X' then 0
-  else if (get prob (r + dr) (c + dc)) /= 'M' then 0
-  else if (get prob (r + 2 * dr) (c + 2 * dc)) /= 'A' then 0
-  else if (get prob (r + 3 * dr) (c + 3 * dc)) /= 'S' then 0
-  else 1
-
-dirs : List (Int × Int)
-dirs = tail $ _,_ <$> 0 :: 0 - 1 :: 1 :: Nil <*> 0 :: 0 - 1 :: 1 :: Nil
-
-part1 : Problem → Int
-part1 (P size text) = go 0 0 0
-  where
-    go : Int → Int → Int → Int
-    go acc r c =
-      if r == size then acc else
-      if c == size then go acc (r + 1) 0 else
-      let acc = foldl _+_ acc $ map (check (P size text) r c) dirs in
-      go acc r (c + 1)
-
-pats : List (Char × Char × Char × Char)
-pats = ('M', 'M', 'S', 'S') ::
-       ('S', 'M', 'M', 'S') ::
-       ('S', 'S', 'M', 'M') ::
-       ('M', 'S', 'S', 'M') ::
-       Nil
-
-check2 : Problem → Int → Int → (Char × Char × Char × Char) → Int
-check2 prob r c (w,x,y,z) =
-  if (get prob r c) /= 'A' then 0
-  else if (get prob (r - 1) (c - 1)) /= w then 0
-  else if (get prob (r - 1) (c + 1)) /= x then 0
-  else if (get prob (r + 1) (c + 1)) /= y then 0
-  else if (get prob (r + 1) (c - 1)) /= z then 0
-  else 1
-
-part2 : Problem → Int
-part2 (P size text) = go 0 0 0
-  where
-    go : Int → Int → Int → Int
-    go acc r c =
-      if r == size then acc else
-      if c == size then go acc (r + 1) 0 else
-      let acc = foldl _+_ acc $ map (check2 (P size text) r c) pats in
-      go acc r (c + 1)
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let lines = split (trim text) "\n"
-  -- I'm going to assume it's square for convenience
-  let size = length lines
-  printLn $ "part1 " ++ show (part1 $ P (cast size) text)
-  printLn $ "part2 " ++ show (part2 $ P (cast size) text)
-
-main : IO Unit
-main = do
-  run "aoc2024/day4/eg.txt"
-  run "aoc2024/day4/input.txt"
diff --git a/playground/samples/aoc2024/Day4.newt b/playground/samples/aoc2024/Day4.newt
new file mode 120000
index 0000000..46fd6cf
--- /dev/null
+++ b/playground/samples/aoc2024/Day4.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day4.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day5.newt b/playground/samples/aoc2024/Day5.newt
deleted file mode 100644
index 690ea58..0000000
--- a/playground/samples/aoc2024/Day5.newt
+++ /dev/null
@@ -1,77 +0,0 @@
-module Day5
-
-import Prelude
-import Node
-import Aoc
-import SortedMap
-
-data Prob : U where
-  MkProb : List (Int × Int) -> List (List Int) → Prob
-
-parseRule : String → Maybe (Int × Int)
-parseRule txt =
-  let (a :: b :: Nil) = nums' "|" txt  | _ => Nothing
-  in Just (a,b)
-
-parse : String → Maybe Prob
-parse text = do
-  let (a :: b :: Nil) = split (trim text) "\n\n" | pts => Nothing
-  rules <- traverse parseRule $ split a "\n"
-  let updates = map (nums' ",") $ split b "\n"
-  Just $ MkProb rules updates
-
-RuleMap : U
-RuleMap = SortedMap Int (List Int)
-
-getDisallowed : Int → RuleMap → List Int
-getDisallowed key rmap = fromMaybe Nil (map snd $ lookupMap key rmap)
-
-mkRuleMap : List (Int × Int) -> RuleMap
-mkRuleMap rules = foldl go EmptyMap rules
-  where
-    go : RuleMap → Int × Int → RuleMap
-    go rmap (b,a) = updateMap a (b :: getDisallowed a rmap) rmap
-
-scan : RuleMap → List Int -> List Int -> Bool
-scan rmap interdit Nil = True
-scan rmap interdit (x :: xs) =
-  if elem x interdit then False
-  else scan rmap (getDisallowed x rmap ++ interdit) xs
-
-fix : RuleMap → List Int → List Int
-fix rmap Nil = Nil
-fix rmap (x :: xs) =
-  let interdit = getDisallowed x rmap in
-  let (prefix,rest) = partition (flip elem interdit) xs
-  in case prefix of
-    Nil => x :: fix rmap rest
-    ys => fix rmap (ys ++ x :: rest)
-
-middle : List Int -> Int
-middle xs = go xs xs
-  where
-    go : List Int → List Int → Int
-    go (x :: xs) (_ :: _ :: ys) = go xs ys
-    go (x :: xs) (_ :: ys) = x
-    go _ _ = 0
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let (Just prob) = parse text | _ => putStrLn "Parse Error"
-  let (MkProb rules things) = prob
-  let rmap = mkRuleMap rules
-  let good = filter (scan rmap Nil) things
-  let part1 = foldl _+_ 0 $ map middle good
-  let bad = filter (not ∘ scan rmap Nil) things
-  putStrLn $ "part1 " ++ show part1
-  let fixed = map (fix rmap) bad
-  printLn $ length bad
-  let part2 = foldl _+_ 0 $ map middle fixed
-  putStrLn $ "part2 " ++ show part2
-
-main : IO Unit
-main = do
-  run "aoc2024/day5/eg.txt"
-  run "aoc2024/day5/input.txt"
diff --git a/playground/samples/aoc2024/Day5.newt b/playground/samples/aoc2024/Day5.newt
new file mode 120000
index 0000000..609fcbf
--- /dev/null
+++ b/playground/samples/aoc2024/Day5.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day5.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day6.newt b/playground/samples/aoc2024/Day6.newt
deleted file mode 100644
index c0bbd38..0000000
--- a/playground/samples/aoc2024/Day6.newt
+++ /dev/null
@@ -1,132 +0,0 @@
-module Day6
-
-import Prelude
-import Node
-import Aoc
-import SortedMap
-
-Point : U
-Point = Int × Int
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-Grid : U
-Grid = SortedMap Point Char
-
-loadData : String → Grid
-loadData text = go (unpack text) 0 0 EmptyMap
-  where
-    go : List Char → Int → Int → SortedMap Point Char → SortedMap Point Char
-    go Nil r c map = map
-    go ('\n' :: cs) r c map = go cs (r + 1) 0 map
-    go (x :: xs) r c map = go xs r (c + 1) $ updateMap (r,c) x map
-
-data Dir : U where North East South West : Dir
-
-instance Show Dir where
-  show North = "N"
-  show East = "E"
-  show South = "S"
-  show West = "W"
-
-instance Ord Dir where
-  a < b = show a < show b
-
-instance Eq (Point × Dir) where
-  (a,b) == (c,d) = a == c && show b == show d
-
-instance Ord (Point × Dir) where
-  (a,b) < (c,d) =
-    if a < c then True
-    else if a /= c then False
-    else b < d
-
-Done : U
-Done = SortedMap (Point × Dir) Unit
-
-turn : Dir → Dir
-turn North = East
-turn East = South
-turn South = West
-turn West = North
-
-instance Cast Dir Char where
-  cast North = '^'
-  cast East = '>'
-  cast South = 'v'
-  cast West = '<'
-
-step : Dir → Point → Point
-step North (r, c) = (r - 1, c)
-step East (r, c) = (r, c + 1)
-step South (r, c) = (r + 1, c)
-step West (r, c) = (r, c - 1)
-
-bad : Point → Bool
-bad (x,y) = x < 0 || y < 0
-
--- third is
-walk : Dir → Point → Grid → Grid
-walk dir pos grid =
-  let grid = updateMap pos 'X' grid in
-  let pos' = step dir pos in
-  case lookupMap pos' grid of
-    Just (_, '#') => walk (turn dir) pos grid
-    Nothing => grid
-    _   => walk dir pos' grid
-
-checkLoop : Grid → Done → Dir → Point → Bool
-checkLoop grid done dir pos =
-  let (Nothing) = lookupMap (pos,dir) done | _ => True in
-  let done = updateMap (pos, dir) MkUnit done
-      pos' = step dir pos
-    in case lookupMap pos' grid of
-        Nothing => False
-        Just (_, '#') => checkLoop grid done (turn dir) pos
-        Just _ => checkLoop grid done dir pos'
-
-part2 : Dir → Point → Grid → Done → List Point → List Point
-part2 dir pos grid done sol =
-  let done = updateMap (pos, dir) MkUnit done
-      grid = updateMap pos 'X' grid
-      turnDir = turn dir
-      turnPos = step turnDir pos
-      pos' = step dir pos in
-  case lookupMap pos' grid of
-    Nothing => sol
-    Just (_, '#') => part2 (turn dir) pos grid done sol
-    Just (_, 'X') => part2 dir pos' grid done sol
-    Just (_, '.') => if checkLoop (updateMap pos' '#' grid) done turnDir pos
-      then part2 dir pos' grid done (pos' :: sol)
-      else part2 dir pos' grid done sol
-    Just x => part2 (trace ("WAT " ++ debugStr x) dir) pos' grid done sol
-
-lookupV : ∀ a. Char → List (a × Char) → Maybe a
-lookupV _ Nil = Nothing
-lookupV needle ((k,v) :: rest) =
-  if v == needle then Just k else lookupV needle rest
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let grid = loadData text
-  let (Just pos) = lookupV '^' (toList grid) | _ => putStrLn "no guard"
-  let grid' = walk North pos grid
-  let xs = filter (\ x => 'X' == snd x) $ toList grid'
-  let part1 = length xs
-  putStrLn $ "part1 " ++ show part1
-
-  let cands = part2 North pos grid EmptyMap Nil
-  -- debugLog $ length cands -- turns out nub isn't needed for these cases, but we'll leave it in
-  putStrLn $ "part2 " ++ show (length $ ordNub cands)
-  printLn $ length $ toList grid
-
-main : IO Unit
-main = do
-  run "aoc2024/day6/eg.txt"
-  run "aoc2024/day6/input.txt"
diff --git a/playground/samples/aoc2024/Day6.newt b/playground/samples/aoc2024/Day6.newt
new file mode 120000
index 0000000..aab08c0
--- /dev/null
+++ b/playground/samples/aoc2024/Day6.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day6.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day7.newt b/playground/samples/aoc2024/Day7.newt
deleted file mode 100644
index 95609a6..0000000
--- a/playground/samples/aoc2024/Day7.newt
+++ /dev/null
@@ -1,58 +0,0 @@
-module Day7
-
-import Prelude
-import Node
-import Aoc
-
-Prob : U
-Prob = Int × List Int
-
-cases : Int → Int → List Int → Bool
-cases goal acc Nil = goal == acc
-cases goal acc (x :: xs) =
-  if goal < acc then False
-  else if cases goal (x + acc) xs then True
-  else cases goal (x * acc) xs
-
-part1 : Prob → Bool
-part1 (goal, x :: xs) = cases goal x xs
-part1 _ = False
-
-cat : Int → Int → Int
-cat x y = stringToInt $ show x ++ show y
-
-cases2 : Int → Int → List Int → Bool
-cases2 goal acc Nil = goal == acc
-cases2 goal acc (x :: xs) =
-  if goal < acc then False
-  else if cases2 goal (x + acc) xs then True
-  else if cases2 goal (x * acc) xs then True
-  else cases2 goal (cat acc x) xs
-
-part2 : Prob → Bool
-part2 (goal, x :: xs) = cases2 goal x xs
-part2 _ = False
-
-parse : String -> Maybe (List Prob)
-parse text = do
-  traverse parseLine $ split (trim text) "\n"
-  where
-    parseLine : String → Maybe Prob
-    parseLine line = do
-      let (a :: b :: Nil) = split line ": " | _ => Nothing
-      Just (stringToInt a , nums b)
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let (Just probs) = parse text | _ => putStrLn "parse error"
-  let p1 = foldl _+_ 0 $ map fst $ filter part1 probs
-  putStrLn $ "part1 " ++ show p1
-  let p2 = foldl _+_ 0 $ map fst $ filter part2 probs
-  putStrLn $ "part2 " ++ show p2
-
-main : IO Unit
-main = do
-  run "aoc2024/day7/eg.txt"
-  run "aoc2024/day7/input.txt"
diff --git a/playground/samples/aoc2024/Day7.newt b/playground/samples/aoc2024/Day7.newt
new file mode 120000
index 0000000..f4ec895
--- /dev/null
+++ b/playground/samples/aoc2024/Day7.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day7.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day8.newt b/playground/samples/aoc2024/Day8.newt
deleted file mode 100644
index 6215b12..0000000
--- a/playground/samples/aoc2024/Day8.newt
+++ /dev/null
@@ -1,95 +0,0 @@
-module Day8
-
-import Prelude
-import Node
-import Aoc
-import SortedMap
-
-Point : U
-Point = Int × Int
-
-instance Add Point where
-  (a,b) + (c,d) = (a + c, b + d)
-
-instance Sub Point where
-  (a,b) - (c,d) = (a - c, b - d)
-
-Ant : U
-Ant = Char × Int × Int
-
--- This should be a utility...
-parse : String → List Ant
-parse text = go 0 0 (unpack text) Nil
-  where
-    -- might as well be tail recursive
-    go : Int → Int → List Char → List Ant → List Ant
-    go row col Nil ants = ants
-    go row col ('\n' :: cs) ants = go (row + 1) 0 cs ants
-    go row col (c :: cs) ants = go row (col + 1) cs ((c,row,col) :: ants)
-
-doPair : Point → Point → List Point
-doPair x y = let d = y - x in y + d :: x - d :: Nil
-
-doGroup : List Ant -> List Point
-doGroup (x :: xs) = join $ doGroup xs ::  map (doPair (snd x) ∘ snd) xs
-doGroup Nil = Nil
-
-group : List Ant → (List Ant) → List (List Ant)
-group (a :: as) Nil = group as (a :: Nil)
-group (a :: as) (b :: bs) =
-  if fst a == fst b
-    then group as (a :: b :: bs)
-    else (b :: bs) :: group as (a :: Nil)
-group Nil bs = bs :: Nil
-
-max : Int → Int → Int
-max a b = if a < b then b else a
-
-check : Int → Point → Bool
-check mr (r,c) = 0 <= r && 0 <= c && r <= mr && c <= mr
-
-
-doPair2 : Int -> Point → Point → List Point
-doPair2 m x y = go x (y - x) ++ go y (x - y)
-  where
-    go : Point -> Point -> List Point
-    go pt d = if check m pt then pt :: go (pt + d) d else Nil
-
-doGroup2 : Int -> List Ant -> List Point
-doGroup2 m (x :: xs) = join $ doGroup2 m xs ::  map (doPair2 m (snd x) ∘ snd) xs
-doGroup2 m Nil = Nil
-
-instance Ord Point where
-  (a,b) < (c,d) = a < c || a == c && b < d
-
-instance Eq Point where
-  (a,b) == (c,d) = a == c && b == d
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let points = parse text
-  let maxrow = trace "maxrow" $ foldl max 0 $ map (fst ∘ snd) points
-  let maxcol = trace "maxcol" $ foldl max 0 $ map (snd ∘ snd) points
-  let ants = filter (\ pt => fst pt /= '.') points
-  let ants = qsort (\ x y => fst x < fst y) ants
-  let groups = group ants Nil
-  let stuff = join $ map doGroup groups
-  let nodes = filter (check maxrow) stuff
-
-  let part1 = length $ ordNub nodes
-  putStrLn $ "part1 " ++ show part1
-
-  let stuff2 = join $ map (doGroup2 maxrow) groups
-  let part2 = length $ ordNub stuff2
-  putStrLn $ "part2 " ++ show part2
-
-
-
-
-
-main : IO Unit
-main = do
-  run "aoc2024/day8/eg.txt"
-  run "aoc2024/day8/input.txt"
diff --git a/playground/samples/aoc2024/Day8.newt b/playground/samples/aoc2024/Day8.newt
new file mode 120000
index 0000000..b6520de
--- /dev/null
+++ b/playground/samples/aoc2024/Day8.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day8.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Day9.newt b/playground/samples/aoc2024/Day9.newt
deleted file mode 100644
index fd05c3b..0000000
--- a/playground/samples/aoc2024/Day9.newt
+++ /dev/null
@@ -1,127 +0,0 @@
-module Day9
-
-import Prelude
-import Node
-import Aoc
-import SortedMap
-
-File : U
-File = Int × Int × Int
-
-parse : String -> List File
-parse cs = go 0 (unpack $ trim cs) Nil
-  where
-    go : Int -> List Char -> List File -> List File
-    go id (a :: b :: cs) acc =
-      go (id + 1) cs ((id, (ord a - 48), (ord b - 48)) :: acc)
-    go id (a :: cs) acc = go (id + 1) cs ((id, (ord a - 48), 0) :: acc)
-    go _ _ acc = reverse acc
-
-part1 : List File -> Int
-part1 fs = go 0 0 fs $ reverse fs
-  where
-    go : Int -> Int -> List File -> List File -> Int
-    go pos csum Nil bwd = ?
-    go pos csum fwd Nil = csum
-    go pos csum ((id, 0, 0) :: fwd) bwd = go pos csum fwd bwd
-    go pos csum fwd ((id, 0, _) :: bwd) = go pos csum fwd bwd
-    go pos csum ((id, 0, k) :: fs) ((id', l, g) :: bwd) =
-      if id == id' then csum
-      else go (pos + 1) (csum + pos * id') ((id, 0, k - 1) :: fs) ((id', l - 1, g) :: bwd)
-    go pos csum ((id, k, gap) :: fs) ((id', l, g) :: rest) =
-      if id == id'
-        then go (pos + 1) (csum + pos * id) ((id, k, gap) :: fs) ((id', l - 1, g) :: Nil)
-        else go (pos + 1) (csum + pos * id) ((id, k - 1, gap) :: fs) ((id', l, g) :: rest)
-
-min : Int → Int → Int
-min a b = if a < b then a else b
-
--- I really do want records...
-Node : U
-Node = Int × Int × File
-
-FileSystem : U
-FileSystem = SortedMap Int Node
-
-mkfs : List File → FileSystem
-mkfs = foldl go EmptyMap
-  where
-    go : FileSystem → File → FileSystem
-    go fs (id,l,g) = updateMap id (id - 1, id + 1, id, l, g) fs
-
-removeNode : Int → FileSystem → FileSystem
-removeNode ix fs =
-  -- yeah, I want records..
-  let (Just (_ ,p1,n1, i1, l1, g1)) = lookupMap ix fs | _ => fs in
-  let (Just (_, p2, _, i2, l2, g2)) = lookupMap p1 fs | _ => fs in
-  let fs = updateMap p1 (p2, n1, i2, l2, g2 + l1 + g1) fs in
-  let (Just (_, _, n2, i2, l2, g2)) = lookupMap n1 fs | _ => fs in
-  updateMap n1 (p1, n2, i2, l2, g2) fs
-
-insertNode : Int → File → FileSystem → FileSystem
-insertNode ix (i,l,g) fs =
-  -- previous
-  let (Just (_, p1, n1, i1, l1, g1)) = lookupMap ix fs | _ => fs in
-  let fs = updateMap ix (p1,i,i1,l1,0) fs in
-  let fs = updateMap i (ix, n1, i,l,g1 - l) fs in
-  let (Just (_, p2, n2, i2, l2, g2)) = lookupMap n1 fs | _ => fs in
-  updateMap n1 (i, n2, i2, l2, g2) fs
-
-defrag : FileSystem → Int -> Int → Int → FileSystem
-defrag fs start end limit =
-  case lookupMap end fs of
-    Nothing => fs
-    Just (k,(p,n,id,l,g)) =>
-      -- our only optimization...
-      if limit <= l then defrag fs start p limit else
-      case search l start end of
-        Nothing => defrag fs start p (min l limit)
-        Just (id',l',g') =>
-          defrag (insertNode id' (id,l,g) $ removeNode end fs) start p limit
-  where
-    search : Int → Int → Int -> Maybe File
-    search size pos end =
-      if pos == end then Nothing else
-      case lookupMap pos fs of
-        Nothing => Nothing
-        Just (_,(p,n,id,l,g)) =>
-          if size <= g then Just (id,l,g)
-          else search size n end
-
-check : FileSystem → Int
-check fs = go 0 0 $ files 0 Lin
-  where
-    files : Int → SnocList File → List File
-    files start acc = case lookupMap start fs of
-      Nothing => acc <>> Nil
-      Just (_, _, n, f) => files n (acc :< f)
-
-    go : Int → Int → List File → Int
-    go pos csum Nil = csum
-    go pos csum ((id,l,g) :: rest) =
-      if l == 0 then go (pos + g) csum rest
-      else go (pos + 1) (csum + pos * id) ((id, l - 1, g) :: rest)
-
-part2 : List File → Int
-part2 files =
-  let fs = mkfs files
-      end = cast (length files) - 1
-      fs' = defrag fs 0 end end
-  in check fs'
-
-run : String -> IO Unit
-run fn = do
-  putStrLn fn
-  text <- readFile fn
-  let files = parse $ trim text
-  putStrLn $ show (length files) ++  " files"
-  let p1 = part1 files
-  putStrLn $ "part1 " ++ show p1
-  let p2 = part2 files
-  putStrLn $ "part2 " ++ show p2
-  pure MkUnit
-
-main : IO Unit
-main = do
-  run "aoc2024/day9/eg.txt"
-  run "aoc2024/day9/input.txt"
diff --git a/playground/samples/aoc2024/Day9.newt b/playground/samples/aoc2024/Day9.newt
new file mode 120000
index 0000000..0563fc0
--- /dev/null
+++ b/playground/samples/aoc2024/Day9.newt
@@ -0,0 +1 @@
+../../../aoc2024/Day9.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/DayXX.newt b/playground/samples/aoc2024/DayXX.newt
new file mode 120000
index 0000000..2837f25
--- /dev/null
+++ b/playground/samples/aoc2024/DayXX.newt
@@ -0,0 +1 @@
+../../../aoc2024/DayXX.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Node.newt b/playground/samples/aoc2024/Node.newt
index f14580c..1e033da 120000
--- a/playground/samples/aoc2024/Node.newt
+++ b/playground/samples/aoc2024/Node.newt
@@ -1 +1 @@
-../../../aoc2023/Node.newt
\ No newline at end of file
+../../../aoc2024/Node.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Parser.newt b/playground/samples/aoc2024/Parser.newt
new file mode 120000
index 0000000..33e3852
--- /dev/null
+++ b/playground/samples/aoc2024/Parser.newt
@@ -0,0 +1 @@
+../../../aoc2024/Parser.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/Prelude.newt b/playground/samples/aoc2024/Prelude.newt
index 2f6704c..2fa97af 120000
--- a/playground/samples/aoc2024/Prelude.newt
+++ b/playground/samples/aoc2024/Prelude.newt
@@ -1 +1 @@
-../../../newt/Prelude.newt
\ No newline at end of file
+../../../aoc2024/Prelude.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/SortedMap.newt b/playground/samples/aoc2024/SortedMap.newt
deleted file mode 100644
index f661b08..0000000
--- a/playground/samples/aoc2024/SortedMap.newt
+++ /dev/null
@@ -1,67 +0,0 @@
-module SortedMap
-
-import Prelude
-
-data T23 : Nat -> U -> U -> U where
-  Leaf : ∀ k v. k -> v -> T23 Z k v
-  Node2 : ∀ h k v. T23 h k v -> k -> T23 h k v -> T23 (S h) k v
-  Node3 : ∀ h k v. T23 h k v -> k -> T23 h k v -> k -> T23 h k v -> T23 (S h) k v
-
-lookupT23 : ∀ h k v. {{Ord k}} {{Eq k}} -> k -> T23 h k v -> Maybe (k × v)
-lookupT23 key (Leaf k v)= if k == key then Just (k,v) else Nothing
-lookupT23 key (Node2 t1 k1 t2) =
-  if key <= k1 then lookupT23 key t1 else lookupT23 key t2
-lookupT23 key (Node3 t1 k1 t2 k2 t3) =
-  if key <= k1 then lookupT23 key t1
-  else if key <= k2 then lookupT23 key t2
-  else lookupT23 key t3
-
-insertT23 : ∀ h k v. {{Ord k}} {{Eq k}} -> k -> v -> T23 h k v -> Either (T23 h k v) (T23 h k v × k × T23 h k v)
-insertT23 key value (Leaf k v) =
-  if key == k then Left (Leaf key value)
-  else if key <= k then Right (Leaf key value, key, Leaf k v)
-  else Right (Leaf k v, k, Leaf key value)
-insertT23 key value (Node2 t1 k1 t2) =
-  if key <= k1 then
-    case insertT23 key value t1 of
-      Left t1' => Left (Node2 t1' k1 t2)
-      Right (a,b,c) => Left (Node3 a b c k1 t2)
-  else case insertT23 key value t2 of
-      Left t2' => Left (Node2 t1 k1 t2')
-      Right (a,b,c) => Left (Node3 t1 k1 a b c)
-insertT23 key value (Node3 t1 k1 t2 k2 t3) =
-  if key <= k1 then
-    case insertT23 key value t1 of
-      Left t1' => Left (Node3 t1' k1 t2 k2 t3)
-      Right (a,b,c) => Right (Node2 a b c, k1, Node2 t2 k2 t3)
-  else if key <= k2 then
-    case insertT23 key value t2 of
-      Left t2' => Left (Node3 t1 k1 t2' k2 t3)
-      Right (a,b,c) => Right (Node2 t1 k1 a, b, Node2 c k2 t3)
-  else
-    case insertT23 key value t3 of
-      Left t3' => Left (Node3 t1 k1 t2 k2 t3')
-      Right (a,b,c) => Right (Node2 t1 k1 t2, k2, Node2 a b c)
-
-data SortedMap : U -> U -> U where
-  EmptyMap : ∀ k v. SortedMap k v
-  MapOf : ∀ k v h. T23 h k v -> SortedMap k v
-
-lookupMap : ∀ k v. {{Ord k}} {{Eq k}} -> k -> SortedMap k v -> Maybe (k × v)
-lookupMap k EmptyMap = Nothing
-lookupMap k (MapOf map) = lookupT23 k map
-
-updateMap : ∀ k v. {{Ord k}} {{Eq k}} -> k -> v -> SortedMap k v -> SortedMap k v
-updateMap k v EmptyMap = MapOf $ Leaf k v
-updateMap k v (MapOf map) = case insertT23 k v map of
-  Left map' => MapOf map'
-  Right (a, b, c) => MapOf (Node2 a b c)
-
-toList : ∀ k v. SortedMap k v → List (k × v)
-toList {k} {v} (MapOf smap) = reverse $ go smap Nil
-  where
-    go : ∀ h. T23 h k v → List (k × v) → List (k × v)
-    go (Leaf k v) acc = (k, v) :: acc
-    go (Node2 t1 k1 t2) acc = go t2 (go t1 acc)
-    go (Node3 t1 k1 t2 k2 t3) acc = go t3 $ go t2 $ go t1 acc
-toList _ = Nil
diff --git a/playground/samples/aoc2024/SortedMap.newt b/playground/samples/aoc2024/SortedMap.newt
new file mode 120000
index 0000000..9cea5d0
--- /dev/null
+++ b/playground/samples/aoc2024/SortedMap.newt
@@ -0,0 +1 @@
+../../../aoc2024/SortedMap.newt
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day1 b/playground/samples/aoc2024/day1
new file mode 120000
index 0000000..91e1bf3
--- /dev/null
+++ b/playground/samples/aoc2024/day1
@@ -0,0 +1 @@
+../../../aoc2024/day1
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day1/eg.txt b/playground/samples/aoc2024/day1/eg.txt
deleted file mode 100644
index dfca0b1..0000000
--- a/playground/samples/aoc2024/day1/eg.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-3   4
-4   3
-2   5
-1   3
-3   9
-3   3
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day10 b/playground/samples/aoc2024/day10
new file mode 120000
index 0000000..26a37c8
--- /dev/null
+++ b/playground/samples/aoc2024/day10
@@ -0,0 +1 @@
+../../../aoc2024/day10
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day11 b/playground/samples/aoc2024/day11
new file mode 120000
index 0000000..aee1604
--- /dev/null
+++ b/playground/samples/aoc2024/day11
@@ -0,0 +1 @@
+../../../aoc2024/day11
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day12 b/playground/samples/aoc2024/day12
new file mode 120000
index 0000000..6cf3270
--- /dev/null
+++ b/playground/samples/aoc2024/day12
@@ -0,0 +1 @@
+../../../aoc2024/day12
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day13 b/playground/samples/aoc2024/day13
new file mode 120000
index 0000000..b033837
--- /dev/null
+++ b/playground/samples/aoc2024/day13
@@ -0,0 +1 @@
+../../../aoc2024/day13
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day14 b/playground/samples/aoc2024/day14
new file mode 120000
index 0000000..9c0aceb
--- /dev/null
+++ b/playground/samples/aoc2024/day14
@@ -0,0 +1 @@
+../../../aoc2024/day14
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day2 b/playground/samples/aoc2024/day2
new file mode 120000
index 0000000..aae6369
--- /dev/null
+++ b/playground/samples/aoc2024/day2
@@ -0,0 +1 @@
+../../../aoc2024/day2
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day2/eg.txt b/playground/samples/aoc2024/day2/eg.txt
deleted file mode 100644
index b49c10d..0000000
--- a/playground/samples/aoc2024/day2/eg.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-7 6 4 2 1
-1 2 7 8 9
-9 7 6 2 1
-1 3 2 4 5
-8 6 4 4 1
-1 3 6 7 9
diff --git a/playground/samples/aoc2024/day3 b/playground/samples/aoc2024/day3
new file mode 120000
index 0000000..f693f06
--- /dev/null
+++ b/playground/samples/aoc2024/day3
@@ -0,0 +1 @@
+../../../aoc2024/day3
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day3/eg.txt b/playground/samples/aoc2024/day3/eg.txt
deleted file mode 100644
index f274bda..0000000
--- a/playground/samples/aoc2024/day3/eg.txt
+++ /dev/null
@@ -1 +0,0 @@
-xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
diff --git a/playground/samples/aoc2024/day4 b/playground/samples/aoc2024/day4
new file mode 120000
index 0000000..5ad8175
--- /dev/null
+++ b/playground/samples/aoc2024/day4
@@ -0,0 +1 @@
+../../../aoc2024/day4
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day4/eg.txt b/playground/samples/aoc2024/day4/eg.txt
deleted file mode 100644
index 32be4b8..0000000
--- a/playground/samples/aoc2024/day4/eg.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-MMMSXXMASM
-MSAMXMSMSA
-AMXSXMAAMM
-MSAMASMSMX
-XMASAMXAMM
-XXAMMXXAMA
-SMSMSASXSS
-SAXAMASAAA
-MAMMMXMMMM
-MXMXAXMASX
-
diff --git a/playground/samples/aoc2024/day5 b/playground/samples/aoc2024/day5
new file mode 120000
index 0000000..8957624
--- /dev/null
+++ b/playground/samples/aoc2024/day5
@@ -0,0 +1 @@
+../../../aoc2024/day5
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day5/eg.txt b/playground/samples/aoc2024/day5/eg.txt
deleted file mode 100644
index 9d146d6..0000000
--- a/playground/samples/aoc2024/day5/eg.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-47|53
-97|13
-97|61
-97|47
-75|29
-61|13
-75|53
-29|13
-97|29
-53|29
-61|53
-97|53
-61|29
-47|13
-75|47
-97|75
-47|61
-75|61
-47|29
-75|13
-53|13
-
-75,47,61,53,29
-97,61,53,29,13
-75,29,13
-75,97,47,61,53
-61,13,29
-97,13,75,29,47
diff --git a/playground/samples/aoc2024/day6 b/playground/samples/aoc2024/day6
new file mode 120000
index 0000000..0c90d86
--- /dev/null
+++ b/playground/samples/aoc2024/day6
@@ -0,0 +1 @@
+../../../aoc2024/day6
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day6/eg.txt b/playground/samples/aoc2024/day6/eg.txt
deleted file mode 100644
index fe5e49f..0000000
--- a/playground/samples/aoc2024/day6/eg.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-....#.....
-.........#
-..........
-..#.......
-.......#..
-..........
-.#..^.....
-........#.
-#.........
-......#...
-
diff --git a/playground/samples/aoc2024/day7 b/playground/samples/aoc2024/day7
new file mode 120000
index 0000000..882e750
--- /dev/null
+++ b/playground/samples/aoc2024/day7
@@ -0,0 +1 @@
+../../../aoc2024/day7
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day7/eg.txt b/playground/samples/aoc2024/day7/eg.txt
deleted file mode 100644
index fc6e099..0000000
--- a/playground/samples/aoc2024/day7/eg.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-190: 10 19
-3267: 81 40 27
-83: 17 5
-156: 15 6
-7290: 6 8 6 15
-161011: 16 10 13
-192: 17 8 14
-21037: 9 7 18 13
-292: 11 6 16 20
diff --git a/playground/samples/aoc2024/day8 b/playground/samples/aoc2024/day8
new file mode 120000
index 0000000..dce1280
--- /dev/null
+++ b/playground/samples/aoc2024/day8
@@ -0,0 +1 @@
+../../../aoc2024/day8
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day8/day1/eg.txt b/playground/samples/aoc2024/day8/day1/eg.txt
deleted file mode 100644
index dfca0b1..0000000
--- a/playground/samples/aoc2024/day8/day1/eg.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-3   4
-4   3
-2   5
-1   3
-3   9
-3   3
\ No newline at end of file
diff --git a/playground/samples/aoc2024/day8/day2/eg.txt b/playground/samples/aoc2024/day8/day2/eg.txt
deleted file mode 100644
index b49c10d..0000000
--- a/playground/samples/aoc2024/day8/day2/eg.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-7 6 4 2 1
-1 2 7 8 9
-9 7 6 2 1
-1 3 2 4 5
-8 6 4 4 1
-1 3 6 7 9
diff --git a/playground/samples/aoc2024/day8/day3/eg.txt b/playground/samples/aoc2024/day8/day3/eg.txt
deleted file mode 100644
index f274bda..0000000
--- a/playground/samples/aoc2024/day8/day3/eg.txt
+++ /dev/null
@@ -1 +0,0 @@
-xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
diff --git a/playground/samples/aoc2024/day8/day4/eg.txt b/playground/samples/aoc2024/day8/day4/eg.txt
deleted file mode 100644
index 32be4b8..0000000
--- a/playground/samples/aoc2024/day8/day4/eg.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-MMMSXXMASM
-MSAMXMSMSA
-AMXSXMAAMM
-MSAMASMSMX
-XMASAMXAMM
-XXAMMXXAMA
-SMSMSASXSS
-SAXAMASAAA
-MAMMMXMMMM
-MXMXAXMASX
-
diff --git a/playground/samples/aoc2024/day8/day5/eg.txt b/playground/samples/aoc2024/day8/day5/eg.txt
deleted file mode 100644
index 9d146d6..0000000
--- a/playground/samples/aoc2024/day8/day5/eg.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-47|53
-97|13
-97|61
-97|47
-75|29
-61|13
-75|53
-29|13
-97|29
-53|29
-61|53
-97|53
-61|29
-47|13
-75|47
-97|75
-47|61
-75|61
-47|29
-75|13
-53|13
-
-75,47,61,53,29
-97,61,53,29,13
-75,29,13
-75,97,47,61,53
-61,13,29
-97,13,75,29,47
diff --git a/playground/samples/aoc2024/day8/day6/eg.txt b/playground/samples/aoc2024/day8/day6/eg.txt
deleted file mode 100644
index fe5e49f..0000000
--- a/playground/samples/aoc2024/day8/day6/eg.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-....#.....
-.........#
-..........
-..#.......
-.......#..
-..........
-.#..^.....
-........#.
-#.........
-......#...
-
diff --git a/playground/samples/aoc2024/day8/day7/eg.txt b/playground/samples/aoc2024/day8/day7/eg.txt
deleted file mode 100644
index fc6e099..0000000
--- a/playground/samples/aoc2024/day8/day7/eg.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-190: 10 19
-3267: 81 40 27
-83: 17 5
-156: 15 6
-7290: 6 8 6 15
-161011: 16 10 13
-192: 17 8 14
-21037: 9 7 18 13
-292: 11 6 16 20
diff --git a/playground/samples/aoc2024/day8/eg.txt b/playground/samples/aoc2024/day8/eg.txt
deleted file mode 100644
index 78a1e91..0000000
--- a/playground/samples/aoc2024/day8/eg.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-............
-........0...
-.....0......
-.......0....
-....0.......
-......A.....
-............
-............
-........A...
-.........A..
-............
-............
diff --git a/src/Lib/ProcessDecl.idr b/src/Lib/ProcessDecl.idr
index 27a3dd3..bc33de0 100644
--- a/src/Lib/ProcessDecl.idr
+++ b/src/Lib/ProcessDecl.idr
@@ -232,13 +232,13 @@ processDecl (Def fc nm clauses) = do
   -- Day1.newt is a test case
   -- tm' <- nf [] tm
   tm' <- zonk top 0 [] tm
-  putStrLn "NF\n\{render 80 $ pprint[] tm'}"
+  when top.verbose $ putStrLn "NF\n\{render 80 $ pprint[] tm'}"
   -- TODO we want to keep both versions, but this is checking in addition to erasing
   -- currently CompileExp is also doing erasure.
   -- TODO we need erasure info on the lambdas or to fake up an appropriate environment
   -- and erase inside. Currently the checking is imprecise
   tm'' <- erase [] tm' []
-  putStrLn "ERASED\n\{render 80 $ pprint[] tm'}"
+  when top.verbose $ putStrLn "ERASED\n\{render 80 $ pprint[] tm'}"
   debug "Add def \{nm} \{pprint [] tm'} : \{pprint [] ty}"
   updateDef nm fc ty (Fn tm')
   -- logMetas mstart
@@ -347,10 +347,10 @@ processDecl (Instance instfc ty decls) = do
        let ty' = foldr (\(MkBind fc nm' icit rig ty'), acc => Pi fc nm' icit rig ty' acc) ty tele
        let nm' = "\{instname},\{nm}"
        -- we're working with a Tm, so we define directly instead of processDecl
-       setDef nm' fc ty' Axiom
        let Just (Def fc name xs) = find (\case (Def y name xs) => name == nm; _ => False) decls
           | _ => error instfc "no definition for \{nm}"
 
+       setDef nm' fc ty' Axiom
        let decl = (Def fc nm' xs)
        putStrLn "***"
        putStrLn "«\{nm'}» : \{pprint [] ty'}"
@@ -358,7 +358,8 @@ processDecl (Instance instfc ty decls) = do
        pure $ Just decl
      _ => pure Nothing
   -- This needs to be declared before processing the defs, but the defs need to be
-  -- declared before this
+  -- declared before this - side effect is that a duplicate def is noted at the first
+  -- member
   processDecl sigDecl
   for_ (mapMaybe id defs) $ \decl => do
     -- debug because already printed above, but nice to have it near processing