Dirtbike rider jumps over a hill of a racetrack.
The dirtbike rider is standing by the racetrack.
The dirtbike rider can not be jumping over a hill of the racetrack and be standing by it at the same time.
exists x1 x2 x3 x4 x5.(a_topic(x1) & over(x1,x4) & of(x4,x5) & n_racetrack(x5) & n_hill(x4) & n_jump(x1) & of(x1,x3) & n_rider(x3) & (x1 = x2) & ne_org_dirtbike(x2))
exists e1 x1 x2 x3.(n_racetrack(x3) & n_rider(x1) & of(x1,x2) & n_dirtbike(x2) & by(e1,x3) & Actor(e1,x1) & v_stand(e1))