A man is walking along a beach.
A person is walking along a beach.
The man is a person.
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_man(x1))
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_person(x1))