A band playing in the park.
People are at the park.
A band is people.
exists x1 x2 x3.(n_park(x3) & a_topic(x1) & in(x1,x3) & n_playing(x1) & of(x1,x2) & n_band(x2))
exists p1 x1 x2.(n_park(x2) & at(x1,x2) & n_people(x1))