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Corrections for filter basis
1. Empty set by porton on 2007-11-20 05:37:53 (accepted) (4)
2. minor, but... by plclark on 2007-07-16 15:49:10 (accepted)
3. emphasis by Mathprof on 2006-06-14 16:52:32 (accepted)
4. subset, not member by jduchon on 2005-10-14 08:05:01 (accepted)

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