diff --git a/2015/5/input b/2015/5/input
new file mode 100644
index 0000000..a9b6e77
--- /dev/null
+++ b/2015/5/input
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diff --git a/2015/5/sol.hs b/2015/5/sol.hs
new file mode 100755
index 0000000..808bcdc
--- /dev/null
+++ b/2015/5/sol.hs
@@ -0,0 +1,102 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -p "haskellPackages.ghcWithPackages (p: [ ])"
+#! nix-shell -i runghc
+
+-- imports
+
+import Data.Map (Map)
+import qualified Data.Map as M
+
+import Data.List (isInfixOf, nub)
+
+import Control.Monad (liftM2)
+
+-- solution composition
+
+main :: IO ()
+-- main = print =<< sol2
+main = print $ (\l -> not . any (liftM2 (==) head last) $ windows 2 [0..length (windows 2 l) - 1]) $ "aaa"
+
+fileContent :: IO String
+fileContent = readFile "./input"
+
+sol :: (LineData -> Bool) -> IO Int
+sol isnice = pure . length . (filter isnice) . M.elems . parseInput =<< fileContent
+
+sol1 :: IO Int
+sol1 = sol isNice
+
+sol2 :: IO Int
+sol2 = sol isNice'
+
+-- input parsing
+
+type FileData = Map String LineData
+data LineData = LineData { content :: String
+                         , vowels :: [Char]
+                         , vowelCount :: Int
+                         , consonants :: [Char]
+                         , consonantCount :: Int
+                         } deriving Show
+
+parseInput :: String -> FileData
+parseInput s = M.fromList $ zip ls $ map parseLine ls
+  where ls = lines s
+
+parseLine :: String -> LineData
+parseLine l = LineData { content = l
+                       , vowels = vs
+                       , vowelCount = length vs
+                       , consonants = cs
+                       , consonantCount = length cs
+                       } where
+                            vs = filter (`elem`"aoeui") l
+                            cs = filter (`notElem`"aoeui") l
+
+-- helper functions
+
+rotate :: Int -> [a] -> [a]
+rotate _ [] = []
+rotate n xs = zipWith const (drop n (cycle xs)) xs
+
+windows :: Int -> [a] -> [[a]]
+windows n xs = take (l-n+1) $ map (take n) rots
+  where 
+    l = length xs
+    rots = map (`rotate` xs) [0..l-1]
+
+isPalindrome :: Eq a => [a] -> Bool
+isPalindrome xs = firstHalf == secondHalf 
+  where
+    firstHalf = take half xs
+    secondHalf = reverse $ take half $ reverse xs
+    half = (length xs) `div` 2
+
+occurenceCount :: (Ord a, Eq a) => [a] -> [Int]
+occurenceCount xs = rec xs M.empty
+  where
+    rec [] _ = []
+    rec (x:xs) mem = case M.lookup x mem of
+        Just i -> i : rec xs (M.adjust (+1) x mem)
+        Nothing -> 0 : rec xs (M.insert x 1 mem)
+
+-- problem solution algorithms
+
+isNice :: LineData -> Bool
+isNice ld = atLeastThreeVowels && atLeastOneDoubleLetter && noIllegalSubstrings
+  where
+    atLeastThreeVowels = vc >= 3
+    atLeastOneDoubleLetter = or $ drop 1 $ reverse $ zipWith (==) (rotate 1 l) l
+    noIllegalSubstrings = null $ filter (`isInfixOf` l) illegalSubstrings
+    illegalSubstrings = ["ab", "cd", "pq", "xy"]
+    l = content ld
+    vc = vowelCount ld
+
+isNice' :: LineData -> Bool
+isNice' ld = containsPairWithoutOverlapping && containsThreeLetterSandwich
+  where
+    containsPairWithoutOverlapping = containsPair && notOverlapping
+    containsPair = any (/=0) $ occurenceCount $ windows 2 l
+    notOverlapping = not . any (liftM2 (==) head last) $ windows 2 [0..length (windows 2 l) - 1]
+    containsThreeLetterSandwich = not . null $ filter isPalindrome $ windows 3 l
+    l = content ld
diff --git a/2021/3/input b/2021/3/input
new file mode 100644
index 0000000..29fa12f
--- /dev/null
+++ b/2021/3/input
@@ -0,0 +1,1000 @@
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diff --git a/2023/11/input b/2023/11/input
new file mode 100644
index 0000000..761a2ee
--- /dev/null
+++ b/2023/11/input
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diff --git a/2024/1/odin/example.txt b/2024/1/odin/example.txt
new file mode 100644
index 0000000..b8af9ad
--- /dev/null
+++ b/2024/1/odin/example.txt
@@ -0,0 +1,6 @@
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diff --git a/2024/1/odin/input.txt b/2024/1/odin/input.txt
new file mode 100644
index 0000000..cf109b6
--- /dev/null
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diff --git a/2024/1/odin/main b/2024/1/odin/main
new file mode 100755
index 0000000..6f38e59
Binary files /dev/null and b/2024/1/odin/main differ
diff --git a/2024/1/odin/main.odin b/2024/1/odin/main.odin
new file mode 100644
index 0000000..566ba73
--- /dev/null
+++ b/2024/1/odin/main.odin
@@ -0,0 +1,31 @@
+package aoc2024day1
+
+import "core:fmt"
+import "core:os"
+import "core:strconv"
+import "core:strings"
+
+main :: proc() {
+	fmt.println("hello world")
+	fmt.println("timmy's first odin")
+
+	buf: [15000]byte
+	num_bytes, _ := os.read(os.stdin, buf[:])
+
+	dyn := make([dynamic]byte)
+	for i := 0; i < num_bytes; i += 1 do append(&dyn, buf[i])
+
+	s := strings.to_string({dyn})
+	lines, _ := strings.split_lines(s)
+
+	for l in lines {
+		if l == "" do break
+
+		t, _ := strings.split(l, "   ")
+		l, r := t[0], t[1]
+		a, _ := strconv.parse_int(l)
+		b, _ := strconv.parse_int(r)
+
+		fmt.println(a, b)
+	}
+}
diff --git a/2024/day_1/uiua/README.md b/2024/1/uiua/README.md
similarity index 100%
rename from 2024/day_1/uiua/README.md
rename to 2024/1/uiua/README.md
diff --git a/2024/day_2/uiua/README.md b/2024/2/uiua/README.md
similarity index 100%
rename from 2024/day_2/uiua/README.md
rename to 2024/2/uiua/README.md
diff --git a/2024/day_3/uiua/README.md b/2024/3/uiua/README.md
similarity index 100%
rename from 2024/day_3/uiua/README.md
rename to 2024/3/uiua/README.md
diff --git a/2024/day_4/uiua/README.md b/2024/4/uiua/README.md
similarity index 100%
rename from 2024/day_4/uiua/README.md
rename to 2024/4/uiua/README.md