data/advent20b.txt

   1                    A
   2                    A
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  21   #.#.#.#                 ###.#.#
  22   #...#..DI             BU....#..LF
  23   #####.#                 #.#####
  24 YN......#               VT..#....QG
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  36            B   J   C
  37            U   P   P