ADDED   day12-example.txt
Index: day12-example.txt
==================================================================
--- day12-example.txt
+++ day12-example.txt
@@ -0,0 +1,16 @@
+initial state: #..#.#..##......###...###
+
+...## => #
+..#.. => #
+.#... => #
+.#.#. => #
+.#.## => #
+.##.. => #
+.#### => #
+#.#.# => #
+#.### => #
+##.#. => #
+##.## => #
+###.. => #
+###.# => #
+####. => #

ADDED   day12-input.txt
Index: day12-input.txt
==================================================================
--- day12-input.txt
+++ day12-input.txt
@@ -0,0 +1,34 @@
+initial state: .#..##..#.....######.....#....####.##.#.#...#...##.#...###..####.##.##.####..######......#..##.##.##
+
+#.... => .
+.##.# => #
+#..## => .
+....# => .
+###.# => #
+...#. => #
+#...# => #
+#.### => .
+.#... => #
+...## => .
+..### => .
+####. => .
+##.## => .
+..##. => .
+.#.## => #
+#..#. => #
+..... => .
+#.#.. => .
+##.#. => #
+.#### => #
+##### => .
+#.##. => #
+.#..# => #
+##... => .
+..#.# => #
+##..# => #
+.###. => .
+.#.#. => #
+#.#.# => #
+###.. => .
+.##.. => .
+..#.. => .