two horses with riders, race along the track.
A single horse walks slowly along a path.
There are either two horses or a single horse (one). The horse(s) either races or walks slowly. A track is not the same thing as a path.
exists x1 x2 x3 x4.(n_track(x4) & a_topic(x1) & with(x1,x2) & rel(x2,x3) & along(x3,x4) & n_race(x3) & n_rider(x2) & n_horse(x1) & card_eq_2(x1))
exists e1 s1 s2 x1 x2.(along(e1,x2) & n_path(x2) & a_slowly(s2) & Manner(e1,s2) & Actor(e1,x1) & v_walk(e1) & n_horse(x1) & a_single(s1) & Theme(s1,x1))