diff --git a/2021/d20/ex1/ex1.py b/2021/d20/ex1/ex1.py
deleted file mode 100755
index 3a65ef4..0000000
--- a/2021/d20/ex1/ex1.py
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from typing import List, NamedTuple, Set, Tuple
-
-
-class Point(NamedTuple):
-    x: int
-    y: int
-
-
-Algorithm = List[bool]
-Image = Set[Point]
-
-
-def solve(input: List[str]) -> int:
-    def parse() -> Tuple[Algorithm, Image]:
-        algo_str, blank, *image_str = input
-
-        assert blank == ""  # Sanity check
-        assert len(algo_str) == 512  # Sanity check
-
-        algo = [c == "#" for c in algo_str]
-        image = {
-            Point(i, j)
-            for i in range(len(image_str))
-            for j in range(len(image_str[0]))
-            if image_str[i][j] == "#"
-        }
-
-        return algo, image
-
-    def do_step(algo: Algorithm, image: Image, step: int) -> Image:
-        min_x, max_x = min(p.x for p in image), max(p.x for p in image)
-        min_y, max_y = min(p.y for p in image), max(p.y for p in image)
-
-        def color(p: Point) -> bool:
-            # Always return true if we *know* that it is lit
-            if p in image:
-                return True
-            # Return early if the rules don't lead to a flashing infinity case
-            flashes_infinity = algo[0] and not algo[-1]
-            if not flashes_infinity:
-                return False
-            # Pixels in proximity to the image are assumed to change their state normally
-            if min_x <= p.x <= max_x and min_y <= p.y <= max_y:
-                return False
-            # Odd indices have a "lit infinity" which turns off, and vice versa
-            return (step % 2) == 1
-
-        def bits(p: Point) -> int:
-            x, y = p
-            res = 0
-            for dx, dy in itertools.product(range(-1, 1 + 1), repeat=2):
-                res = (res << 1) + color(Point(x + dx, y + dy))
-            return res
-
-        # We know the image we care for cannot grow by more than 1 per turn
-        xs, ys = range(min_x - 1, max_x + 1 + 1), range(min_y - 1, max_y + 1 + 1)
-
-        res: Image = set()
-        for p in map(Point._make, itertools.product(xs, ys)):
-            if algo[bits(p)]:
-                res.add(p)
-
-        return res
-
-    rules, image = parse()
-    for i in range(2):
-        image = do_step(rules, image, i)
-
-    return len(image)
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d20/ex1/input b/2021/d20/ex1/input
deleted file mode 100644
index 2afe0ac..0000000
--- a/2021/d20/ex1/input
+++ /dev/null
@@ -1,102 +0,0 @@
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diff --git a/2021/d20/ex2/ex2.py b/2021/d20/ex2/ex2.py
deleted file mode 100755
index 4564961..0000000
--- a/2021/d20/ex2/ex2.py
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env python
-
-import itertools
-import sys
-from typing import List, NamedTuple, Set, Tuple
-
-
-class Point(NamedTuple):
-    x: int
-    y: int
-
-
-Algorithm = List[bool]
-Image = Set[Point]
-
-
-def solve(input: List[str]) -> int:
-    def parse() -> Tuple[Algorithm, Image]:
-        algo_str, blank, *image_str = input
-
-        assert blank == ""  # Sanity check
-        assert len(algo_str) == 512  # Sanity check
-
-        algo = [c == "#" for c in algo_str]
-        image = {
-            Point(i, j)
-            for i in range(len(image_str))
-            for j in range(len(image_str[0]))
-            if image_str[i][j] == "#"
-        }
-
-        return algo, image
-
-    def do_step(algo: Algorithm, image: Image, step: int) -> Image:
-        min_x, max_x = min(p.x for p in image), max(p.x for p in image)
-        min_y, max_y = min(p.y for p in image), max(p.y for p in image)
-
-        def color(p: Point) -> bool:
-            # Always return true if we *know* that it is lit
-            if p in image:
-                return True
-            # Return early if the rules don't lead to a flashing infinity case
-            flashes_infinity = algo[0] and not algo[-1]
-            if not flashes_infinity:
-                return False
-            # Pixels in proximity to the image are assumed to change their state normally
-            if min_x <= p.x <= max_x and min_y <= p.y <= max_y:
-                return False
-            # Odd indices have a "lit infinity" which turns off, and vice versa
-            return (step % 2) == 1
-
-        def bits(p: Point) -> int:
-            x, y = p
-            res = 0
-            for dx, dy in itertools.product(range(-1, 1 + 1), repeat=2):
-                res = (res << 1) + color(Point(x + dx, y + dy))
-            return res
-
-        # We know the image we care for cannot grow by more than 1 per turn
-        xs, ys = range(min_x - 1, max_x + 1 + 1), range(min_y - 1, max_y + 1 + 1)
-
-        res: Image = set()
-        for p in map(Point._make, itertools.product(xs, ys)):
-            if algo[bits(p)]:
-                res.add(p)
-
-        return res
-
-    rules, image = parse()
-    for i in range(50):
-        image = do_step(rules, image, i)
-
-    return len(image)
-
-
-def main() -> None:
-    input = [line.strip() for line in sys.stdin.readlines()]
-    print(solve(input))
-
-
-if __name__ == "__main__":
-    main()
diff --git a/2021/d20/ex2/input b/2021/d20/ex2/input
deleted file mode 100644
index 2afe0ac..0000000
--- a/2021/d20/ex2/input
+++ /dev/null
@@ -1,102 +0,0 @@
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