A man performing in a track or athletic competition.
The man is going to run a marathon.
Not every athletic competition is a marathon to run.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & (n_track(x3) | exists s1.(n_competition(x3) & a_athletic(s1) & Theme(s1,x3))) & Actor(e1,x2) & v_perform(e1) & (x1 = x2) & n_man(x1))
exists e1 p1 x1.(n_man(x1) & Topic(e1,p1) & Actor(e1,x1) & v_go(e1) & exists e2 x2.(Theme(e2,x2) & Actor(e2,x1) & v_run(e2) & n_marathon(x2)))