Man pages matching name owl::directsemantics::element::equivalentclasses in section 3pm:

OWL::DirectSemantics::Element::EquivalentClasses.3pm.en	debian 10 / libowl-directsemantics-perl
OWL::DirectSemantics::Element::EquivalentClasses.3pm.en	debian 12 / libowl-directsemantics-perl