A band playing at an event in a park.
They are indoors.
One cannot be indoors and in a park at the same time.
exists x1 x2 x3 x4.(a_topic(x1) & in(x1,x4) & n_park(x4) & at(x1,x3) & n_event(x3) & n_playing(x1) & of(x1,x2) & n_band(x2))
exists p1 x1.(n_thing(x1) & exists x2.((x1 = x2) & n_indoor(x2)))