Two men with sunglasses on their heads facing each other in a crowd.
Two men have their backs to each other.
The men cannot be facing each other while having their backs to each other.
exists x1 x2 x3 x4.(a_topic(x1) & all x5.(n_other(x5) -> exists e1 x6.(in(e1,x6) & n_crowd(x6) & Theme(e1,x5) & Actor(e1,x4) & v_face(e1))) & (x1 = x4) & with(x1,x2) & on(x2,x3) & n_head(x3) & of(x3,x1) & n_thing(x1) & n_sunglass(x2) & n_man(x1) & card_eq_2(x1))
exists x1 x2.(all x3.(n_other(x3) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & to(x2,x3))) & n_back(x2) & of(x2,x1) & n_thing(x1) & n_man(x1) & card_eq_2(x1))