diff --git a/2021/d01/ex2/ex2.py b/2021/d01/ex2/ex2.py
index 7895e2b..2ef9e60 100755
--- a/2021/d01/ex2/ex2.py
+++ b/2021/d01/ex2/ex2.py
@@ -18,7 +18,7 @@ def sliding_window(iterable, n):
 
 def solve(input: List[int]) -> int:
     windowed = [sum(window) for window in sliding_window(input, 3)]
-    return sum(prev < cur for (prev, cur) in zip(windowed, windowed[1:]))
+    return sum(prev < cur for (prev, cur) in itertools.pairwise(windowed))
 
 
 def main() -> None:
diff --git a/2021/d02/ex1/ex1.py b/2021/d02/ex1/ex1.py
index f28dd77..61c98d6 100755
--- a/2021/d02/ex1/ex1.py
+++ b/2021/d02/ex1/ex1.py
@@ -9,8 +9,8 @@ def solve(input: List[str]) -> int:
     x, y = 0, 0
 
     for instruction in input:
-        dir, length_ = instruction.split(" ")
-        length = int(length_)
+        dir, length = instruction.split(" ")
+        length = int(length)
         if dir == "forward":
             x += length
         elif dir == "down":
diff --git a/2021/d02/ex2/ex2.py b/2021/d02/ex2/ex2.py
index b48215c..a5a5f3d 100755
--- a/2021/d02/ex2/ex2.py
+++ b/2021/d02/ex2/ex2.py
@@ -9,8 +9,8 @@ def solve(input: List[str]) -> int:
     x, y, aim = 0, 0, 0
 
     for instruction in input:
-        dir, length_ = instruction.split(" ")
-        length = int(length_)
+        dir, length = instruction.split(" ")
+        length = int(length)
         if dir == "forward":
             x += length
             y += length * aim
diff --git a/2021/d05/ex1/ex1.py b/2021/d05/ex1/ex1.py
index 065c9a4..1281378 100755
--- a/2021/d05/ex1/ex1.py
+++ b/2021/d05/ex1/ex1.py
@@ -3,10 +3,12 @@
 import itertools
 import sys
 from collections import Counter
-from typing import Iterable, List, Tuple, NamedTuple
+from dataclasses import dataclass
+from typing import Iterable, List, Tuple
 
 
-class Point(NamedTuple):
+@dataclass
+class Point:
     x: int
     y: int
 
@@ -38,12 +40,12 @@ def solve(input: List[str]) -> int:
 
         if p1.x == p2.x:
             for y in inclusive_range_any_order(p1.y, p2.y):
-                yield Point(p1.x, y)
+                yield (p1.x, y)
             return
 
         if p1.y == p2.y:
             for x in inclusive_range_any_order(p1.x, p2.x):
-                yield Point(x, p1.y)
+                yield (x, p1.y)
             return
 
         assert False  # Sanity check
diff --git a/2021/d05/ex2/ex2.py b/2021/d05/ex2/ex2.py
index b3ead14..9a63990 100755
--- a/2021/d05/ex2/ex2.py
+++ b/2021/d05/ex2/ex2.py
@@ -3,10 +3,12 @@
 import itertools
 import sys
 from collections import Counter
-from typing import Iterable, List, Tuple, NamedTuple
+from dataclasses import dataclass
+from typing import Iterable, List, Tuple
 
 
-class Point(NamedTuple):
+@dataclass
+class Point:
     x: int
     y: int
 
@@ -41,7 +43,7 @@ def solve(input: List[str]) -> int:
         if p1.y == p2.y:
             ys = itertools.repeat(p1.y)
 
-        yield from map(Point._make, zip(xs, ys))
+        yield from zip(xs, ys)
 
     lines = list(map(parse_line, input))
     counts = Counter(itertools.chain.from_iterable(line_to_points(l) for l in lines))
diff --git a/2021/d06/ex1/ex1.py b/2021/d06/ex1/ex1.py
index 2f21557..92475ad 100755
--- a/2021/d06/ex1/ex1.py
+++ b/2021/d06/ex1/ex1.py
@@ -4,13 +4,10 @@ import itertools
 import sys
 from collections import Counter
 from dataclasses import dataclass
-from typing import Iterator, List, TypeVar
+from typing import Iterator, List
 
 
-T = TypeVar("T")
-
-
-def nth(iterable: Iterator[T], n: int) -> T:
+def nth(iterable: Iterator[int], n: int) -> int:
     return next(itertools.islice(iterable, n, None))
 
 
diff --git a/2021/d06/ex2/ex2.py b/2021/d06/ex2/ex2.py
index 16dd7f7..439c21e 100755
--- a/2021/d06/ex2/ex2.py
+++ b/2021/d06/ex2/ex2.py
@@ -4,13 +4,10 @@ import itertools
 import sys
 from collections import Counter
 from dataclasses import dataclass
-from typing import Iterator, List, TypeVar
+from typing import Iterator, List
 
 
-T = TypeVar("T")
-
-
-def nth(iterable: Iterator[T], n: int) -> T:
+def nth(iterable: Iterator[int], n: int) -> int:
     return next(itertools.islice(iterable, n, None))
 
 
diff --git a/2021/d08/ex2/ex2.py b/2021/d08/ex2/ex2.py
index 1553e29..279b199 100755
--- a/2021/d08/ex2/ex2.py
+++ b/2021/d08/ex2/ex2.py
@@ -19,7 +19,7 @@ def solve(input: List[str]) -> int:
             [set(s) for s in signals.split()], [set(o) for o in outputs.split()]
         )
 
-    def deduce_signals(entry: Entry) -> Dict[int, Set[str]]:
+    def deduce_signals(entry: Entry) -> Dict[int, str]:
         _1, _7, _4, *signals_to_deduce, _8 = sorted(entry.signals, key=len)
         signals = {
             1: _1,
diff --git a/2021/d10/ex1/ex1.py b/2021/d10/ex1/ex1.py
index 4667d43..89d462d 100755
--- a/2021/d10/ex1/ex1.py
+++ b/2021/d10/ex1/ex1.py
@@ -2,7 +2,7 @@
 
 import itertools
 import sys
-from typing import List, Optional, cast
+from typing import List, Optional
 
 
 def solve(input: List[str]) -> int:
@@ -36,7 +36,7 @@ def solve(input: List[str]) -> int:
     }
 
     return sum(
-        score[line[cast(int, find_illegal_char(line))]]
+        score[line[find_illegal_char(line)]]
         for line in input
         if find_illegal_char(line) is not None
     )
diff --git a/2021/d10/ex2/ex2.py b/2021/d10/ex2/ex2.py
index 27de8ac..377b73d 100755
--- a/2021/d10/ex2/ex2.py
+++ b/2021/d10/ex2/ex2.py
@@ -28,7 +28,7 @@ def solve(input: List[str]) -> int:
 
         return None
 
-    def complete_line(input: str) -> str:
+    def complete_line(input: List[str]) -> str:
         chunks: List[str] = []
         start_to_end = {
             "(": ")",
@@ -45,7 +45,7 @@ def solve(input: List[str]) -> int:
             # Otherwise we must match the last open chunk
             assert start_to_end[chunks.pop()] == c  # Sanity check
 
-        return "".join(reversed(list(start_to_end[c] for c in chunks)))
+        return reversed(list(start_to_end[c] for c in chunks))
 
     def score_completion(completion: str) -> int:
         char_score = {
diff --git a/2021/d13/ex1/ex1.py b/2021/d13/ex1/ex1.py
deleted file mode 100755
index fb71b61..0000000
--- a/2021/d13/ex1/ex1.py
+++ /dev/null
@@ -1,71 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from copy import deepcopy
-from typing import Iterable, List, Tuple, cast
-
-Paper = List[List[bool]]
-Instruction = Tuple[str, int]
-
-
-def solve(input: List[str]) -> int:
-    def transpose(paper: Paper) -> Paper:
-        return cast(Paper, list(zip(*paper)))
-
-    def fold_along_y(paper: Paper, y: int) -> Paper:
-        assert not any(paper[y])  # Sanity check
-        assert y >= len(paper) // 2  # Ensure that we can actually fold the paper
-
-        paper = deepcopy(paper)
-        for i, j in zip(itertools.count(y, -1), range(y, len(paper))):
-            paper[i] = [(dot_i or dot_j) for dot_i, dot_j in zip(paper[i], paper[j])]
-
-        paper = paper[:y]
-        return paper
-
-    def fold_along_x(paper: Paper, x: int) -> Paper:
-        return transpose(fold_along_y(transpose(paper), x))
-
-    def do_folds(paper: Paper, instructions: Iterable[Instruction]) -> Paper:
-        for axis, n in instructions:
-            if axis == "x":
-                paper = fold_along_x(paper, n)
-            elif axis == "y":
-                paper = fold_along_y(paper, n)
-            else:
-                assert False  # Sanity check
-
-        return paper
-
-    def parse() -> Tuple[Paper, List[Instruction]]:
-        paper_part = itertools.takewhile(lambda s: s != "", input)
-        fold_part = itertools.islice(
-            itertools.dropwhile(lambda s: s != "", input), 1, None
-        )
-
-        points = {(int(x), int(y)) for x, y in map(lambda s: s.split(","), paper_part)}
-        folds = [
-            (axis[-1], int(n)) for axis, n in map(lambda s: s.split("="), fold_part)
-        ]
-
-        width, height = max(p[0] for p in points), max(p[1] for p in points)
-
-        paper = [
-            [(x, y) in points for x in range(width + 1)] for y in range(height + 1)
-        ]
-
-        return paper, folds
-
-    paper, instructions = parse()
-
-    return sum(itertools.chain.from_iterable(do_folds(paper, instructions[:1])))
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d13/ex1/input b/2021/d13/ex1/input
deleted file mode 100644
index d11c2b7..0000000
--- a/2021/d13/ex1/input
+++ /dev/null
@@ -1,890 +0,0 @@
-1159,502
-291,184
-850,631
-460,631
-301,707
-768,56
-654,829
-582,466
-490,276
-261,3
-793,35
-559,453
-497,288
-594,275
-458,264
-1044,387
-654,842
-925,22
-688,72
-224,833
-1228,2
-1034,487
-420,830
-172,717
-1049,198
-669,305
-1168,49
-157,304
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-1036,1
-118,549
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-909,294
-467,74
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-271,35
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-75,864
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-176,100
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-199,332
-23,634
-654,329
-748,526
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-378,474
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-1012,810
-383,859
-1163,5
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-631,241
-179,436
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-495,324
-321,169
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-137,603
-174,428
-734,140
-460,157
-43,569
-58,586
-196,632
-313,784
-199,287
-
-fold along x=655
-fold along y=447
-fold along x=327
-fold along y=223
-fold along x=163
-fold along y=111
-fold along x=81
-fold along y=55
-fold along x=40
-fold along y=27
-fold along y=13
-fold along y=6
diff --git a/2021/d13/ex2/ex2.py b/2021/d13/ex2/ex2.py
deleted file mode 100755
index d6a99af..0000000
--- a/2021/d13/ex2/ex2.py
+++ /dev/null
@@ -1,75 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from copy import deepcopy
-from typing import Iterable, List, Tuple, cast
-
-Paper = List[List[bool]]
-Instruction = Tuple[str, int]
-
-
-def solve(input: List[str]) -> None:
-    def transpose(paper: Paper) -> Paper:
-        return cast(Paper, list(zip(*paper)))
-
-    def fold_along_y(paper: Paper, y: int) -> Paper:
-        assert not any(paper[y])  # Sanity check
-        assert y >= len(paper) // 2  # Ensure that we can actually fold the paper
-
-        paper = deepcopy(paper)
-        for i, j in zip(itertools.count(y, -1), range(y, len(paper))):
-            paper[i] = [(dot_i or dot_j) for dot_i, dot_j in zip(paper[i], paper[j])]
-
-        paper = paper[:y]
-        return paper
-
-    def fold_along_x(paper: Paper, x: int) -> Paper:
-        return transpose(fold_along_y(transpose(paper), x))
-
-    def do_folds(paper: Paper, instructions: Iterable[Instruction]) -> Paper:
-        for axis, n in instructions:
-            if axis == "x":
-                paper = fold_along_x(paper, n)
-            elif axis == "y":
-                paper = fold_along_y(paper, n)
-            else:
-                assert False  # Sanity check
-
-        return paper
-
-    def parse() -> Tuple[Paper, List[Instruction]]:
-        paper_part = itertools.takewhile(lambda s: s != "", input)
-        fold_part = itertools.islice(
-            itertools.dropwhile(lambda s: s != "", input), 1, None
-        )
-
-        points = {(int(x), int(y)) for x, y in map(lambda s: s.split(","), paper_part)}
-        folds = [
-            (axis[-1], int(n)) for axis, n in map(lambda s: s.split("="), fold_part)
-        ]
-
-        width, height = max(p[0] for p in points), max(p[1] for p in points)
-
-        paper = [
-            [(x, y) in points for x in range(width + 1)] for y in range(height + 1)
-        ]
-
-        return paper, folds
-
-    def dump(paper: Paper) -> None:
-        for line in paper:
-            print("".join("#" if dot else "." for dot in line))
-
-    paper, instructions = parse()
-
-    dump(do_folds(paper, instructions))
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    solve(input)
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d13/ex2/input b/2021/d13/ex2/input
deleted file mode 100644
index d11c2b7..0000000
--- a/2021/d13/ex2/input
+++ /dev/null
@@ -1,890 +0,0 @@
-1159,502
-291,184
-850,631
-460,631
-301,707
-768,56
-654,829
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-261,3
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-594,275
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-688,72
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-43,569
-58,586
-196,632
-313,784
-199,287
-
-fold along x=655
-fold along y=447
-fold along x=327
-fold along y=223
-fold along x=163
-fold along y=111
-fold along x=81
-fold along y=55
-fold along x=40
-fold along y=27
-fold along y=13
-fold along y=6