w * M
A permutation $p \in \mathfrak{S}_m$ acts on the space of $m \times n$ 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 Permutations/Documentation/operationsDocs.m2:244:0.