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The number of distinct four of fewer face-joined unit cubes forming the polycube pieces of the 3-by-3-by-3 Soma cube dissection puzzle invented by Piet Hein in 1936. [Beedassy]

 

  Submitted: 2009-08-25 02:26:10;   Last Modified: 2009-08-25 11:10:47.



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