For example, 6 contributes 6 when it’s in an undoubled position, and it contributes 3 from a doubled position because 6 doubled equals 12 and 1 + 2 = 3. Messing up a single number while typing your ...
You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and instantly see a red error message ...
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