CHECKER	4	4
[0,0,1,0,-1,0]	[1,0,2,0,1,1]	[2,0,1,1,2,2]	[3,0,2,0,3,2]	
[1,1,1,2,2,2]	
[0,2,0,4,1,3]	[1,2,0,2,1,3]	[2,2,3,2,1,2]	[3,2,4,2,3,4]	
[1,3,0,4,1,4]