A stack of cards is face down in front of you. Every time you move one into a second stack you can either deal (put the card on top on to the next pile) or dip (put the second card above the top card and deal both together) If you finish this with the stack twice, all cards will be in the same order. Why?
HintTry it with cards face up?
AnswerBecause a dip is exactly like dealing twice.
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