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dtgk 22/07

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Lyndon-Jones | 09:40 Sat 29th Jul 2006 | Quizzes & Puzzles
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a closed surface with one side formed by passing one end of a tube through its side and joining it to the other end
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Possibly a torus
klein bottle
You had me confused there, Lyndon-Jones, until I realised you were doing last week's crossword!
And me !!!!

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dtgk 22/07

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