A horse and rider jumping a small fence.
A horse and rider are competing in a race.
not all fence-jumping horses are competing in races
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 e1 x1 x2 x3 x4.(in(e1,x4) & n_race(x4) & Actor(e1,x1) & v_compete(e1) & n_rider(x3) & n_horse(x2) & subset_of(x3,x1) & subset_of(x2,x1))