8 9
1 0 0 0 0 0 1 1 0
1 0 0 1 0 0 1 1 0
1 0 1 1 0 0 0 0 0
1 0 1 0 0 0 1 1 0
1 0 0 0 0 1 1 0 1
1 0 1 1 0 0 0 0 1
1 0 1 0 0 0 1 0 1
1 0 1 0 1 1 1 0 1