Two people look over a terrace wall.
Two people are spying on other people.
Look does not imply spying.
exists e1 x1 x2 x3.(over(e1,x2) & n_wall(x2) & of(x2,x3) & n_terrace(x3) & Actor(e1,x1) & v_look(e1) & n_people(x1) & card_eq_2(x1))
exists e1 x1 x2.(on(e1,x2) & -(x2 = x1) & n_people(x1) & n_people(x1) & n_people(x2) & Actor(e1,x1) & v_spy(e1) & card_eq_2(x1))