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Possible Duplicate:
Purpose of Community Wiki

I just posted this question.

I saw no options to make it community wiki. I remember that option. Why I don't see it?

marked as duplicate by user8 Feb 5 '12 at 4:33

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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See What can we do to make Community Wiki better? on Meta.SO. So you can request it for moderators, but I just convert to CW if the question requires CW status. If you want it, please explain why.