Two motorcycle racers are driving on a race course.
One motorcycle driver drives through a race course.
If there are two racers, there can't just be one.
exists e1 x1 x2 x3 x4.(on(e1,x3) & n_course(x3) & of(x3,x4) & n_race(x4) & Actor(e1,x1) & v_drive(e1) & n_racer(x1) & of(x1,x2) & n_motorcycle(x2) & card_eq_2(x1))
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & through(e1,x4) & n_course(x4) & of(x4,x5) & n_race(x5) & Theme(e1,x3) & Actor(e1,x2) & v_drive(e1) & (x1 = x3) & n_driver(x2) & n_motorcycle(x1) & card_eq_1(x1))