Two men running outside in a competition.
Two men are competing in a marathon.
Two men may be competing in something other than a marathon.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_competition(x3) & r_outside(e1) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(in(e1,x2) & n_marathon(x2) & Actor(e1,x1) & v_compete(e1) & n_man(x1) & card_eq_2(x1))