Three boys in a forest clearing look at something off-camera.
There are no boys.
There can't be three boys and no boys at the same time.
exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & at(x2,x5) & Time(x5,x6) & n_off-camera(x6) & n_thing(x5) & n_look(x2) & of(x2,x4) & n_clearing(x4) & of(x2,x3) & n_forest(x3) & n_boy(x1) & card_eq_3(x1))
exists p1 x1.-exists x2.((x1 = x2) & n_boy(x2))