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It's just the next higher digit rolling over. If you have the number 19 in decimal, and you add one, you get 20; because you 'wrapped' the 'ones' digit, the 'tens' digit increases.
Same with hexadecimal. The only difference is that each digit has 16 possible values (0, 1, 2 ... D, E, F), rather than only ten. You still must increment the next higher place when one wraps from F to 0.
I suggest you read up on different based numbering systems. In programming, decimal (base-10), binary (base-2), hexadecimal (base-16) and to some extent octal (base-8) are the ones you need to be familiar with.
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And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot.
- Vaarsuvius, Order of the Stick
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