Question: What could be an appropriate proof for this problem? It can be informal explanations. Can you tile a 6 x 6 board with 15 dominoes

What could be an appropriate proof for this problem? It can be informal explanations.

Can you tile a 6 x 6 board with 15 dominoes so that the six empty squares are all in dierent rows and columns? For example, here's an attempt that almost works, but there are two empty squares in the last column

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