w * M
A permutation $p$ acts on the space of $n \times n$ matrices by permuting the rows of the matrix according to the permutation.
The permutation cannot permute more than numRows M elements.
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The permutation can be a permutation on less than numRows M elements.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Permutations/Documentation/operationsDocs.m2:211:0.