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In openoffice-calc, one can create an drop-down list via Data > Validity, and selecting a Cell-range. If my Cell-range contains duplicates, I have also duplicates in my list. Is there a way to avoid this, i.e. that the drop-down list contains no double entries?

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This is the fourth question you've posted in the last hour. Is there a bigger problem you want to ask about? – Pops Mar 11 '11 at 20:21
Thanks, however there is no bigger problem. – student Mar 12 '11 at 10:42

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