seven children are playing on swings in a park.
Children are swinging.
We don't know if are the same children
exists e1 x1 x2 x3.(in(e1,x3) & n_park(x3) & on(e1,x2) & n_swing(x2) & Actor(e1,x1) & v_play(e1) & n_child(x1) & card_eq_7(x1))
exists e1 x1.(Actor(e1,x1) & v_swing(e1) & n_child(x1))