Distinct subjects for predicate cpack:usesSystemFile in graph https://cliopatria.swi-prolog.org/packs/virgil sorted by frequency

ResourceCount
drugs.pl5
reports.pl4
measurements.pl3
reactions.pl3
drug_normalise.pl2
drug_spell_check.pl2
prov.pl2
virgil.pl2
virgil.pl2
aers_report.pl1
aspell.pl1