I remember when I was a child ... a long time ago... seeing 'mayn't' in an old book. It looked very strange even then.
These days, the contraction 'mayn't' no longer exists. You have to use the full form: may not.
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No, you may not
November 26, 2014
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"No, you may not." is the correct response.
November 26, 2014
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