############## 
           ...........#?? 
           ...........+??#
           ##.........####
           ......Z.......#
    ...............M.....#
    ..............##.....#
    ..............##.....#
    .....................#
    ...............Z..#..#
    .................##..#
    ......∩..........##M∩#
   .......∩..........##..#
 .....................#..#
 ........................#
 ........................#
  #...............##.....#
.##...............##.....#
.........................#
.........................#
........#####.........####
.........Z............+$$#
..........Z...........#$$#
##########################