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Ok, the deal is every time you do that operation with any two digit number you get a multiple of nine, for instance, 67-(6+7)=54=4x9, or 38-(3+8)=27=3x9. It can be demonstrated with modular arithmetics in an easy way. So if you take a look, every multiple of nine has the same symbol assigned, and it changes to another symbol when you run the test again, which is what can "disturb" your mind at first.
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Finally I am becoming stupider no more
-the epitaph Paul Erdos wrote for himself
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