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Corrections for Euler characteristic
1. periods by alozano on 2007-05-24 17:39:23 (accepted)
2. final period missing by alozano on 2007-01-09 13:03:56 (accepted)
3. clarity by alozano on 2006-10-02 11:02:05 (accepted)
4. links by mps on 2006-09-04 14:40:53 (accepted)

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