A cowboy in the dirt on the ground next to a horse.
A horse and his rider.
If i cowboy is next to a horse, he is probably the horse's rider.
exists x1 x2 x3 x4 x5.(n_ground(x3) & n_dirt(x2) & a_topic(x1) & in(x1,x2) & on(x2,x3) & to(x4,x5) & n_horse(x5) & next(x3,x4) & n_thing(x4) & n_cowboy(x1))
exists s1 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_rider(x2) & of(x2,x1) & n_male(x1) & subset_of(x1,s1) & n_horse(x1))