A person is riding a horse down a dirt trail.
A person is riding a horse down a trail.
trail is a simplified version of dirt trail
exists e1 x1 x2 x3 x4.(down(e1,x3) & n_trail(x3) & of(x3,x4) & n_dirt(x4) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_person(x1))
exists e1 x1 x2 x3.(down(e1,x3) & n_trail(x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_horse(x2) & n_person(x1))