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  • That's an option, but it has a higher risk to be duplicated is the future. Commented Feb 10, 2014 at 0:53
  • 2
    No higher than any other 10-character string. If you want less chance of collision, you need more characters. That's just a fact of nature.
    – Kevin
    Commented Feb 10, 2014 at 0:55
  • And the chance of collision between two 10-character case-sensitive alnum strings is less than winning the lottery (jackpot) twice in a row. Just for scale.
    – Kevin
    Commented Feb 10, 2014 at 0:59