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Yes, indeed, you can express Q as U'DJ', that's legit. I can't see any way

you can count (FQ)^4 as more than 24 quarter turns, for thats all it is.

In the eyes of the people who count turns, not quarter turns, the

QQ in the middle (4 quarter turns) can be expressed as U^2D^2,

where U^2 and D^2 each count as one, which could be thus contributory

to counting the formula as 22 turns, but surely no more than 24 by

any kind of metric.

By the way, my description of the left-handed wrench in the

annotations was in error, it should have been (F'Q)^4, not (FQ')^4.

(The formula (FQ)^4(QF)^4 is correct as stands).