On a track, an athlete prepares to launch a javelin.
An athlete competes in a track and field competition.
a javelin is used for track and field competitions
exists e1 p1 x1 x2.(on(e1,x2) & n_track(x2) & Topic(e1,p1) & Actor(e1,x1) & v_prepare(e1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_launch(e2) & n_javelin(x3)) & n_athlete(x1))
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & in(x1,x2) & n_competition(x4) & of(x4,x5) & n_field(x5) & n_track(x3) & subset_of(x4,x2) & subset_of(x3,x2) & n_compete(x1) & a_athlete(s1) & Theme(s1,x1))