The two kids are playing at the playground.
Children are playing at a playground.
Kids are children.
exists e1 x1 x2.(n_playground(x2) & n_kid(x1) & card_eq_2(x1) & at(e1,x2) & Actor(e1,x1) & v_play(e1))
exists e1 x1 x2.(at(e1,x2) & n_playground(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1))