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In form entries, what is most commonly understood?

"Please enter alphanumeric characters" or "Please enter letters and numbers"

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I think this is probably more a question for ux.stackexchange.com ; do you want me to migrate? –  Jeromy Anglim Oct 19 '13 at 6:24
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This question appears to be off-topic because it is about UX –  Chuck Sherrington Oct 19 '13 at 23:12
    
I also think this should be migrated to UX –  Josh Gitlin Oct 20 '13 at 13:16
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closed as off-topic by Chuck Sherrington, Skippy, what, Jeromy Anglim Oct 27 '13 at 8:17

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