Two girls hapily playing in a park.
Two brothers are in the park walking.
Brothers are boys, and cannot be girls.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_hapily(s1) & Manner(e1,s1) & in(e1,x3) & n_park(x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_girl(x1) & card_eq_2(x1))
exists p1 x1 x2 x3.(n_walking(x2) & of(x2,x3) & n_park(x3) & in(x1,x2) & n_brother(x1) & card_eq_2(x1))