Do not want something repeated in a certain column

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I have a column that will be filled with screen names (testing new software) and in this column I do not want the users to enter the same screen name twice. How do I keep them from doing it??? Thanks.
 

Excel Facts

Which came first: VisiCalc or Lotus 1-2-3?
Dan Bricklin and Bob Frankston debuted VisiCalc in 1979 as a Visible Calculator. Lotus 1-2-3 debuted in the early 1980's, from Mitch Kapor.

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