Two motorcycle racers are driving on a race course.
Some cyclers are on race course driving.
Cyclers need not imply motorcyclists.
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 p1 x1.(exists e1 x2 x3 x4.(on(x1,x2) & Actor(e1,x4) & v_driving(e1) & (x2 = x4) & n_course(x2) & of(x2,x3) & n_race(x3)) & n_cycler(x1))