A group of jockeys during a horse race.
They are riding horses.
Jockeys ride horses.
exists x1 x2 x3 x4.(a_topic(x1) & during(x1,x3) & n_race(x3) & of(x3,x4) & n_horse(x4) & of(x1,x2) & n_jockey(x2) & n_group(x1))
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2))