00  1    2    33 4 4@ 
0 0 1   2 2  3   4 4@ 
00  1  2   2 3   44@   
0 0 1   2 2  3   4 4@  
00  111  2    33 4 4@  
@ 
  11   2  3   0@ 
  1 1 2 2 3   0@ 
  11  222 3   0@ 
  1 1 2 2 3   0@ 
  11  2 2 333 000@