Four people waiting for their train.
People are hailing taxis
a taxi drives on the street and a train drives on tracks.
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 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hail(e1) & n_taxi(x2) & n_people(x1))