Two boys are sprinting on a running track.
Two boys are racing each other
Sprinting does not imply racing.
exists e1 e2 x1 x2.(on(e1,x2) & n_track(x2) & Actor(e2,x2) & v_run(e2) & Actor(e1,x1) & v_sprint(e1) & n_boy(x1) & card_eq_2(x1))
exists x1.(all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_race(e1))) & n_boy(x1) & card_eq_2(x1))