Two middle-aged men, one of which is holding a camera, have a conversation on the sidewalk.
Two women taking pictures of each other.
Two middle-aged men are not two women.
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(n_sidewalk(x4) & Theme(e2,x6) & Actor(e2,x5) & v_hold(e2) & n_camera(x6) & of(x5,x2) & n_one(x5) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & on(x3,x4) & n_conversation(x3) & (x1 = x2) & n_man(x1) & a_middle-aged(s1) & Theme(s1,x1) & card_eq_2(x1))
exists x1 x2 x3.(a_topic(x1) & all x4.(n_other(x4) -> exists e1.(Theme(e1,x3) & Actor(e1,x2) & v_take(e1) & of(x3,x4))) & n_picture(x3) & (x1 = x2) & n_woman(x1) & card_eq_2(x1))