Question: How many ways can four rooks be put on a chessboard so that no rook can capture any other rook? Or, what is the same:

How many ways can four rooks be put on a chessboard so that no rook can capture any other rook? Or, what is the same: How many ways can 8 markers be placed on an 8 × 8 grid of squares so that there is at most one in each row or column?

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