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Why use “need not” instead of “do not need to”?

In English, why could I say, "No-one need know" and not "No-one needs know". I would say, after all, "No-one needs to know".

marked as duplicate by user19148, coleopterist, James Waldby - jwpat7, cornbread ninja 麵包忍者, user2683 Nov 23 '12 at 21:12

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