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No, it's actually really simple. No matter which two digit number you pick, you will always end up with one of a small number of answers, all of which, except for 0, are multiples of 9 (0, 9, 18, 27, 36, 45, etc). If you look at those numbers, you will see that they always have the same symbol. That way, no matter which number you land on, it will always know the corresponding symbol.
Edit: I see some others posted the same thing before I got around to it.
SpaceAce
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