Two boys are sprinting on a running track.
Two boys are sprinting
If boys are sprinting on a track, they are sprinting.
exists e2 e1 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 e1 x1.(Actor(e1,x1) & v_sprint(e1) & n_boy(x1) & card_eq_2(x1))