First of all, I was inaccurate about the "Dinman" style "cube" - it doesn't
only eliminate twisting, but also some positioning (ie, after the top and middle
are solved, the bottom is automatically solved). Perhaps by the judicious
adding of numbers to the facies, the pure position cube can be made. Also,
the answer to the edge-only subgroup is easy - just remove all the labels from
the corners, so they are all identically monochromatic. Is there a more
elegant solution?
--- Stan
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