This file is indexed.

/usr/lib/R/site-library/combinat/INDEX is in r-cran-combinat 0.0-8-5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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combn                   Generate all combinations of the elements of x
                        taken m at a time.
dmnom                   density of multinomial, and support functions
hcube                   Generate all points on a hypercuboid lattice.
nsimplex                Computes the number of points on a (p,
                        n)-simplex lattice
permn                   Generates all permutations of the elements of
                        x
rmultinomial            Generate random samples from multinomial
                        distributions
x2u                     Convert an x-encoded simplex-lattice point to
                        a u-encoded simplex-lattice point
xsimplex                Generates all points on a (p,n) simplex
                        lattice (i.e. a p-part composition of n).