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