Two children stand on a swing in a playground.
The children are at the playgorund.
Two children standing on the swing instead of sitting in a playground
exists e1 x1 x2 x3.(in(e1,x3) & n_playground(x3) & on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_stand(e1) & n_child(x1) & card_eq_2(x1))
exists p1 x1 x2.(n_playgorund(x2) & n_child(x1) & at(x1,x2))