Two motorcycles race on a track.
A motor cyclist rides his bike by himself.
Race and rides are different.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_track(x3) & n_race(x1) & of(x1,x2) & n_motorcycle(x2) & card_eq_2(x1))
exists e1 x1 x2 x3.(by(e1,x1) & n_male(x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & n_bike(x3) & of(x3,x1) & n_cyclist(x1) & of(x1,x2) & n_motor(x2))