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