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Originally Posted by toonpornblog
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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Yeah, it's the same math. Any two digit number added together and subtracted from itself is a multiple of 9. So no matter what two digit you choose, your number will always be either 9, 18, 27, 36, 45, 54, 63, 72, or 81. So all those numbers on the map hav the same icon, and it of course shows you that icon.