Two men are looking at each other.
Two men can't see each other.
If they can't see then they could not be looking at each other.
exists e1 x1.(all x2.(n_other(x2) -> at(e1,x2)) & Actor(e1,x1) & v_look(e1) & n_man(x1) & card_eq_2(x1))
exists x1.(-exists e1 p1.(all x2.(n_other(x2) -> exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_see(e2))) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1)) & n_man(x1) & card_eq_2(x1))