This file is indexed.

/usr/lib/R/site-library/lpSolve/INDEX is in r-cran-lpsolve 5.6.7-2.

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

The actual contents of the file can be viewed below.

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lp.R                    Solve linear or mixed integer linear programs
lp.assign.R             Solve the assignment problem
lp.transport.R          Solve the transportation problem
make.q8.R		Set up constraint matrix for 8 queens problem
print.lp.R              Print an lp object