...         
      .#z         
       ..         
∆      #.#        
        ..    ##  
        #.   #.#..
        #.###....#
      ####...#    
      #3.z#.##    
      #..#.#..#   
 .....##.X#5......
 .## .##..##...###
  #.. #.### .#..#.
  ##  ##.#.# ...#.
       ##. .#.#...
         #.. #.##.
        #..  ##. .
         .##. ..# 
       #... #.. ##
       #.# ###  ..
       .     ..#.#
       .#   ##.#.#
     # #      #