A greyhound running on a track.
Dog running in dog race.
The greyhound may not be running in a dog race.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_track(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_greyhound(x1))
exists e1 x1 x2 x3.(ne_nam_dog(x1) & in(e1,x2) & n_race(x2) & of(x2,x3) & n_dog(x3) & Actor(e1,x1) & v_run(e1))