Two bmx riders racing on a track
There are people racing
in a both sentence bmx and people is various
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_track(x4) & Actor(e1,x3) & v_race(e1) & (x1 = x3) & n_rider(x1) & of(x1,x2) & n_bmx(x2) & card_eq_2(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_race(e1) & (x2 = x3) & n_people(x2))