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I've seen the same done with a deck of cards. Unless you really pay attention, you might not know. What they do with that one is make the faces incredibly tiny and change them (red spades), with a trick of nine.. (all numbers multiplied/divided by nine are addable to nine (3 * 9 = 27, 2+7 = 9))
The card one took me a second because something looked strange. They stacked the deck of tricks..
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