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2 of 3
3D cube.
Joseph O'Rourke
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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.
Joseph O'Rourke
  • 150.8k
  • 36
  • 358
  • 958