Greyhounds race on a track.
Rabid bears mauling innocent picnickers.
Greyhounds are different animals from bears.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_track(x3) & n_race(x1) & (x1 = x2) & ne_nam_greyhounds(x2))
exists e1 p1 x1.(ne_nam_rabid(x1) & exists e2 s1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_maul(e2) & n_picnicker(x2) & a_innocent(s1) & Theme(s1,x2)) & Topic(e1,p1) & Actor(e1,x1) & v_bear(e1))