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    Hi, can some one explain , how it can be that I have correct answer and test not passed ?

    3 by 3
    . . X X .
    . X . X X
    X . . . X
    . X X X .
    . . X X .

    your solution
    . . X X .
    . X . X X
    X . . . X
    . X X X .
    . . X X .