Four people waiting for their train.
People are waiting.
Four people are waiting so the train must be coming
exists e1 x1 x2 x3.(a_topic(x1) & for(e1,x3) & n_train(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_wait(e1) & (x1 = x2) & n_people(x1) & card_eq_4(x1))
exists e1 x1.(Actor(e1,x1) & v_wait(e1) & n_people(x1))