Two guys riding bikes on a dirt road.
The guys are racing dirt bikes.
Not all bikes are dirt bikes.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x4) & n_road(x4) & of(x4,x5) & n_dirt(x5) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_bike(x3) & (x1 = x2) & n_guy(x1) & card_eq_2(x1))
exists e1 x1 x2 x3.(n_guy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_race(e1) & n_bike(x2) & of(x2,x3) & n_dirt(x3))