#.  .###..#
#..##.##.   ... # 
 .#.#. ...#  ...#.
# ..##  #.. #..#∩.
#. ...  #...#.##..
#.. ..     #...## 
 #..#.  ####....# 
  #..x###..#..#.##
     #..#......#..
     ##z..........
      #..#...##.#.
      ##...##.....
 #.......#.#  #...
 .##.##....# ##  .
      #.#...    ..
      ....###     
     #.##..       
     .# #.#       
    #.   ..