sentences: men changing systems / look usually has a yes major on an birth / cause inanimate in an mean
docs: vaginal_childbirth is birth. if labor occurs then give_birth occurs. birth_certificate is legal_form. live_birth is birth. if lie_in occurs then give_birth occurs. afterbirth is natural_inanimate_thing. birth is change. birth is change_of_location. active_birth is childbirth.