two girls on a bridge dancing with the city skyline in the background
The girls are dancing with nothing but the sky in the background.
If there is nothing but sky, then there cannot be the city skyline in the background.
exists x1 x2 x3 x4 x5 x6.(n_background(x6) & n_skyline(x4) & of(x4,x5) & n_city(x5) & a_topic(x1) & on(x1,x2) & with(x2,x4) & in(x4,x6) & n_dancing(x2) & of(x2,x3) & n_bridge(x3) & n_girl(x1) & card_eq_2(x1))
exists e1 x1 x2 x4.(n_background(x2) & n_sky(x4) & n_girl(x1) & in(e1,x2) & -exists x3.(with(e1,x3) & but(x3,x4) & n_thing(x3)) & Actor(e1,x1) & v_dance(e1))