I have been stuck with this puzzle for weeks. I was told that I can't rotate a single center group by 90 degrees on a 4x4x4. On a 4x4x4 hexagonal dipyramid (meant hexagonal in title) each center group has two cubes that are identical and two that are different. Swapping two sets of adjacent cubes on the same face should produce the same visual result. Does anyone know to swap two sets of center cubes, all on the same face? Everything else is solved and I keep ending with this same problem.
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