Two old men playing instruments on the street.
The older men are playing guitars on the street.
Two old men playing instruments are not necessarily playing guitars.
exists e1 s1 x1 x2 x3 x4.(n_street(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & on(x3,x4) & n_instrument(x3) & (x1 = x2) & n_man(x1) & a_old(s1) & Theme(s1,x1) & card_eq_2(x1))
exists e1 s1 x1 x2 x3.(n_street(x3) & n_man(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2))