Three running men participating in a marathon.
Three men compete in a marathon.
Three men who compete elaborates the "running men participating" in a marathon.
exists e2 e1 x1 x2 x3.(a_topic(x1) & in(e2,x3) & n_marathon(x3) & Actor(e2,x2) & v_participate(e2) & (x1 = x2) & n_man(x1) & Actor(e1,x1) & v_run(e1) & card_eq_3(x1))
exists e1 x1 x2.(in(e1,x2) & n_marathon(x2) & Actor(e1,x1) & v_compete(e1) & n_man(x1) & card_eq_3(x1))