Essentially, if you take any two digit number, add it's two digits together, and subtract them from the original number, you end up with a multiple of 9. Look at the chart it shows with the little symbols. All multiples of 9 are the same symbol...
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"...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."
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