the two couples are chatting by the bus.
Two two couples are chatting
Chatting by the bus means chatting
exists e1 x1 x2.(n_bus(x2) & n_couple(x1) & card_eq_2(x1) & by(e1,x2) & Actor(e1,x1) & v_chat(e1))
exists e1 x1.(Actor(e1,x1) & v_chat(e1) & n_couple(x1) & card_eq_4(x1) & card_eq_4(x1))