Guys are running in a marathon.
Three brothers run a marathon.
The guys running the marathon may not be brothers.
exists e1 x1 x2.(in(e1,x2) & n_marathon(x2) & Actor(e1,x1) & v_run(e1) & n_guy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_run(e1) & n_marathon(x2) & n_brother(x1) & card_eq_3(x1))