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Corrections for De Bruijn--Erd\H{o}s theorem
1. umlaut by Wkbj79 on 2006-07-25 22:51:32 (retracted) (2)
2. broken by Mathprof on 2006-06-13 16:38:04 (retracted) (1)
3. broken by pbruin on 2005-08-16 09:30:24 (accepted) (1)

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