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    for [[2, 0, 0, 1],
    [0, 0, 1, 0],
    [0, 2, 0, 0],
    [0, 0, 0, 4]]
    I have this response :
    Expected: 'This sudoku is unsolvable!',
    instead got: [[2, 4, 3, 1],
    [4, 3, 1, 2],
    [1, 2, 4, 3],
    [3, 1, 2, 4]]
    what am I missing here?
    and there are also some random tests with the same problem.