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replaced http://mathoverflow.net/ with https://mathoverflow.net/

edited Apr 13, 2017 at 12:58

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Just illustrating Noam Elkies' 4-piece solution:

[![Elkies4Piece][1]][1]

[![ElkiesCube3D][2]][2]
^{Bottom face is mostly yellow (except for a little green); two hidden back faces are mauve.}

answered Apr 1, 2017 at 11:52

Joseph O'Rourke

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