Take out at least a few cards from 52 cards (except the king of size) to ensure that the two cards have the same color?

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Analysis:

A deck of poker * * * has four suits, so the worst case is that the first four cards have different suits. It is easy to know that when the fifth card is taken out, it must be the same as one of the first four cards, so:

Take out at least five pieces to ensure that the two pieces are the same color.