A horse and rider jumping a small fence.
A rider is on a horse.
A horse and rider go together with the rider being on top of the horse.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(s1) & Theme(e1,x4) & Actor(e1,x3) & v_jump(e1) & n_fence(x4) & a_small(s2) & Theme(s2,x4) & (s1 = x3) & n_rider(x2) & n_horse(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists p1 x1.(exists x2.(on(x1,x2) & n_horse(x2)) & n_rider(x1))