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1 is blacked out, 0 is white
1100■■□□ 1010■□■□ 0110□■■□ 0000□□□□
forThere are two blacked out squares in each of the 1st, 2nd and 3rd rows and columns and no blacked out squares in the 4th row and column.
1100 1010 0110 0000
for two blacked out squares in each of the 1st, 2nd and 3rd rows and columns and no blacked out squares in the 4th row and column
■■□□ ■□■□ □■■□ □□□□
There are two blacked out squares in each of the 1st, 2nd and 3rd rows and columns and no blacked out squares in the 4th row and column.
