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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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closed as off-topic by Chuck Sherrington, Skippy, what, Jeromy Anglim Oct 27 '13 at 8:17

  • This question does not appear to be about cognitive sciences within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

I think this is probably more a question for ; do you want me to migrate? – Jeromy Anglim Oct 19 '13 at 6:24
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