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