Runners running in a race
Athletes competing.
Runners are athletes, and a race is where they are competing
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_race(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_runner(x1))
exists e1 x1.(Actor(e1,x1) & v_compete(e1) & n_athlete(x1))