A toddler plays on a playground.
The toddler is at a park.
Playgrounds could be located outside of a park.
exists e1 x1 x2.(on(e1,x2) & n_playground(x2) & Actor(e1,x1) & v_play(e1) & n_toddler(x1))
exists p1 x1.(n_toddler(x1) & exists x2.(at(x1,x2) & n_park(x2)))