A couple sits on a car.
Two people are sitting on a car.
A couple means two.
exists e1 x1 x2.(on(e1,x2) & n_car(x2) & Actor(e1,x1) & v_sit(e1) & n_couple(x1))
exists e1 x1 x2.(on(e1,x2) & n_car(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_2(x1))