Group-theoretic commutator, defined as [x,y]=x^(-1)y^(-1)xy
Permutation objects, coerced to word
Robin K. S. Hankin
x <- rperm(10,7)
y <- rperm(10,8)
z <- rperm(10,9)
stopifnot(all(is.id(uu))) # this is the Hall-Witt identity
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