A dog hurdles over a series of poles.
The dog is a Beagle.
The dog is not necessarily a Beagle.
exists x1 x2 x3 x4.(a_topic(x1) & over(x1,x3) & of(x3,x4) & n_pole(x4) & n_series(x3) & n_hurdle(x1) & of(x1,x2) & n_dog(x2))
exists p1 x1.(n_dog(x1) & exists x2.((x1 = x2) & ne_org_beagle(x2)))