trim w
trim rewrites a permutation $p$ as a permutation in $S_n$, where $n$ is the smallest integer such that $p$ is in $\mathfrak{S}_n$. In other words, it returns a permutation where any extraneous fixed points are removed.
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The object trim is a method function with options.
The source of this document is in Permutations/Documentation/mainDocs.m2:797:0.