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14:07, 22 September 2005 (diff | hist) . . (+119)‎ . . Summerschool Aachen 2005/Challenges ‎ (→‎Challenges in Progress)
16:23, 20 September 2005 (diff | hist) . . (+45)‎ . . Summerschool Aachen 2005/Challenges ‎
16:13, 20 September 2005 (diff | hist) . . (+102)‎ . . Summerschool Aachen 2005/Challenges ‎

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