A man and a woman on a path.
People on a path.
People include a man and a woman.
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_path(x2) & n_people(x1))