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Corrections for subset
1. spelling by Mathprof on 2007-05-02 23:22:24 (accepted)
2. proper subset by matte on 2003-06-24 02:49:08 (accepted)
3. Wrong set by kemorgan on 2003-03-24 02:57:38 (accepted)
4. B is undefined by kemorgan on 2003-03-24 02:53:22 (accepted)

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