CHECKER	4	4
[0,0,1,0,0,2]	[1,0,2,0,1,2]	[2,0,2,2,3,1]	
[3,1,2,2,3,3]	
[0,2,-1,3,1,3]	[1,2,0,2,1,3]	[2,2,1,2,2,4]	
[1,3,0,4,1,4]	[3,3,3,5,4,4]