Runners competing in a marathon.
People running.
People are runners. And typically are running in a marathon.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_marathon(x3) & Actor(e1,x2) & v_compete(e1) & (x1 = x2) & n_runner(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_people(x1))