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edited Apr 13, 2017 at 12:58

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I think the question Is it possible to capture a sphere in a knot?Is it possible to capture a sphere in a knot? is an excellent one-step problem.

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created Dec 29, 2009 at 21:17

Ilya Nikokoshev

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I think the question Is it possible to capture a sphere in a knot? is an excellent one-step problem.