##################
 .....∩..∩........#
 .................#
  ..########......#
 ####....'.####...#
##.......#..#.##..#
#∩.#####.####..'..#
##.'...#......##..#
 ####..#...####...#
    ########......#
     .............#
     .............#
      ######......#
           ####...#
              ##..#
               #..#
              ##..#
           ####...#
           #.z....#
      .......zz...#
       ...........#
       ############