/usr/share/acl2-7.1/books/centaur/aig/ is in acl2-books 7.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-7.1/books/centaur/aig/accumulate-nodes-vars.o
/usr/share/acl2-7.1/books/centaur/aig/aig-base.o
/usr/share/acl2-7.1/books/centaur/aig/aig-equivs.o
/usr/share/acl2-7.1/books/centaur/aig/aig-print.o
/usr/share/acl2-7.1/books/centaur/aig/aig-vars-ext.o
/usr/share/acl2-7.1/books/centaur/aig/aig-vars-fast-raw.o
/usr/share/acl2-7.1/books/centaur/aig/aig-vars-fast.o
/usr/share/acl2-7.1/books/centaur/aig/aig-vars.o
/usr/share/acl2-7.1/books/centaur/aig/aig2c.o
/usr/share/acl2-7.1/books/centaur/aig/aiger-help.o
/usr/share/acl2-7.1/books/centaur/aig/aiger.o
/usr/share/acl2-7.1/books/centaur/aig/bddify-correct.o
/usr/share/acl2-7.1/books/centaur/aig/bddify.o
/usr/share/acl2-7.1/books/centaur/aig/best-aig.o
/usr/share/acl2-7.1/books/centaur/aig/count-branches-fast.o
/usr/share/acl2-7.1/books/centaur/aig/eval-restrict.o
/usr/share/acl2-7.1/books/centaur/aig/faig-base.o
/usr/share/acl2-7.1/books/centaur/aig/faig-constructors.o
/usr/share/acl2-7.1/books/centaur/aig/faig-equivs.o
/usr/share/acl2-7.1/books/centaur/aig/g-aig-eval.o
/usr/share/acl2-7.1/books/centaur/aig/induction.o
/usr/share/acl2-7.1/books/centaur/aig/misc.o
/usr/share/acl2-7.1/books/centaur/aig/portcullis.o
/usr/share/acl2-7.1/books/centaur/aig/random-sim.o
/usr/share/acl2-7.1/books/centaur/aignet/aig-cnf.o
/usr/share/acl2-7.1/books/centaur/aignet/aig-sim.o
/usr/share/acl2-7.1/books/centaur/aignet/aiger.o
/usr/share/acl2-7.1/books/centaur/aignet/aignet-absstobj.o
/usr/share/acl2-7.1/books/centaur/aignet/aignet-exec-thms.o
/usr/share/acl2-7.1/books/centaur/aignet/aignet-exec.o
/usr/share/acl2-7.1/books/centaur/aignet/aignet-logic-interface.o
/usr/share/acl2-7.1/books/centaur/aignet/aignet-logic.o
/usr/share/acl2-7.1/books/centaur/aignet/arrays.o
/usr/share/acl2-7.1/books/centaur/aignet/bit-lemmas.o
/usr/share/acl2-7.1/books/centaur/aignet/cnf.o
/usr/share/acl2-7.1/books/centaur/aignet/construction.o
/usr/share/acl2-7.1/books/centaur/aignet/copying.o
/usr/share/acl2-7.1/books/centaur/aignet/eval.o
/usr/share/acl2-7.1/books/centaur/aignet/from-hons-aig-fast-raw.o
/usr/share/acl2-7.1/books/centaur/aignet/from-hons-aig-fast.o
/usr/share/acl2-7.1/books/centaur/aignet/from-hons-aig.o
/usr/share/acl2-7.1/books/centaur/aignet/litp.o
/usr/share/acl2-7.1/books/centaur/aignet/portcullis.o
/usr/share/acl2-7.1/books/centaur/aignet/prune.o
/usr/share/acl2-7.1/books/centaur/aignet/refcounts.o
/usr/share/acl2-7.1/books/centaur/aignet/semantics.o
/usr/share/acl2-7.1/books/centaur/aignet/snodes.o
/usr/share/acl2-7.1/books/centaur/aignet/to-hons-aig.o
/usr/share/acl2-7.1/books/centaur/aignet/types.o
/usr/share/acl2-7.1/books/centaur/aignet/vecsim.o