##.........##
 ........... 
##.........##
#...........#
##.........##
#...........#
##.....Z...##
#....Z......#
#####ZM.#####
    #...#    
   ##...##   
  ##.....##  
  #...∩...#  
  #.......#  
  #...∩...#  
  ##.....##  
   ##...##   
    #####