The horses are racing along the dirt track.
The dogs are running along the track.
Horses are not the same as dogs.
exists e1 x1 x2 x3.(n_track(x2) & of(x2,x3) & n_dirt(x3) & n_horse(x1) & along(e1,x2) & Actor(e1,x1) & v_race(e1))
exists e1 x1 x2.(n_track(x2) & n_dog(x1) & along(e1,x2) & Actor(e1,x1) & v_run(e1))