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There are 2339 ways to arrange the set of twelve pentominoes into a 6-by-10 rectangle, excluding trivial variations obtained by rotation and reflection of the whole rectangle, but including rotation and reflection of a subset of pentominoes. This case was first solved in 1960 by C. B. Haselgrove and Jenifer Haselgrove (now Jenifer Leech).


  Submitted: 2002-04-19 00:51:28;   Last Modified: 2009-11-12 16:35:45.

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