The tips (or small vertices) can rotate independently, and the larger
turn includes the rotation of the adjacent 2 edge pieces and single
middle piece.

This should read:

The tips (or small vertices) can rotate independently, and the larger
turn includes the rotation of the adjacent 3 edge pieces and 3
middle pieces.

...or approximately 29 nonillion (29^30).

This should read:

...or approximately 29 nonillion (29*10^30).

-> Mark <-

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