Two men are speaking on a sidewalk.
Two women haggling with a man.
There cannot be two men if two women are haggling with only one man.
exists e1 x1 x2.(on(e1,x2) & n_sidewalk(x2) & Actor(e1,x1) & v_speak(e1) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(a_topic(x1) & with(e1,x3) & n_man(x3) & Actor(e1,x2) & v_haggle(e1) & (x1 = x2) & n_woman(x1) & card_eq_2(x1))