This returns a list with two entries, first a list of random rows, and then a list of random columns. These specify a random submatrix of the desired size, n1.
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The object chooseRandomSubmatrix is a method function with options.
The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/FastMinors.m2:1696:0.