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63 - 6 - 3 = 54 okay I just figured it out. Everytime you try it, it associates a different symbol to the multiple of 9.
so if you use the above example 63-9 = 54 and look at 54 then click the box you get a different symbol each time, and all the multiples of 9 have the same changed symbol.
Pretty sneaky for about 5 minutes
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