######################
#....................#
#....................#
#....#'#......###....#
#...##.##....##∩##...#
#...#...#....#??.#...#
#...###.#....#?M?#...#
#..##  .##..###'###..#
#..#   ..#..#.....#..#
#∩.#   ..#..###.###..#
#..#     #..#.#.#.#..#
#..#     #..#.#.#.#..#
#∩.#     #..#'#.#'#..#
#..#     #..#.....#..#
#..#    ##  ##...##..#
#...    #..  #...#...#
#...    #... #...#...#
        #....##.##...#
        ......#'#....#
        .............#
        .............#
        ##############