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Mine originated a couple years ago, playing Runescape. I started with one account, which was either auzman or auzman with 3 random numbers. I died a lot, but whenever I died I made a new account because I didn't know how to get my regular starting items back. Eventually, I got to auzman466, found out how to buy my stuff back for free (don't think I died anyways), and it just stuck.