extend(w,n)
A permutation on $n$ symbols is an element of the symmetric group on $n$ symbols, $\mathfrak{S}_n$. However, it can also be regarded as a permutation on $N > n$ symbols as well by fixing the $(n+1)$st through $N$th symbols.
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The object extend is a method function with options.
The source of this document is in Permutations/Documentation/mainDocs.m2:250:0.