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Never mind, I think I figured it out. Temperaltalk and matrix? 00:03, 11 December 2007 (UTC)[reply]
Currently Category:Triangle geometry is both a subcategory and parent category of this category. While this recursion is kind of cool, I think this should be categorized better so that this does not happen. Nat2 (talk) 04:02, 1 November 2012 (UTC)[reply]