#################
  .................#
  .................#
  .....8..8........#
 ..................#
  ######..######...#
       #..#    #...#
       #..#    #...#
  #.####..####.#...#
  #...z..zz.M..#...#
  #.......####.#...#
  #.......#    #...#
  #......z#    #...#
   .....∩.#    #...#
    ##+....    #...#
      #...#    #...#
      #...#    #...#
 .##############...#
...................#
........=∩.........#
####################