...# #.. #. ..#. 
..#.#.##...... .) 
.# . .#..###..#   
####.#........#   
 #...3###....4###.
 ###....#.X..#... 
   ....#.#X4##X.  
 #..#.#.#.X##.##..
#...#.....X#......
.....#. #...#     
.#..##§.##W##     
  ...x....##      
  ...§##.##       
  .#....#         
    ..##          
  ...             
  .#              
             ∆