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Corrections for arrow category
1. minor wording issues by mps on 2007-01-12 19:10:09 (accepted)
2. also known as by CWoo on 2006-09-21 12:10:15 (accepted)
3. Please mark as defining "arrow category". by archibal on 2004-03-11 13:56:51 (accepted)
4. funny borders by akrowne on 2002-06-04 08:23:10 (accepted)
5. do not follow a period with a math expression by djao on 2002-06-01 16:48:52 (accepted)
6. commutative squares by rmilson on 2002-06-01 12:32:22 (accepted)

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