Two boys play on a swing in a playground.
Two girls play on a swing in a playground.
Boys are not the same as girls
exists e1 x1 x2 x3.(in(e1,x3) & n_playground(x3) & on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(in(e1,x3) & n_playground(x3) & on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_play(e1) & n_girl(x1) & card_eq_2(x1))