Two men playing the guitar.
Two men rehearse their favorite song.
The two men could be randomly sitting on a bench together: we can't tell if they rehearse together and certainly whether what they might be playing together is their favorite song.
exists e1 x1 x2 x3.(n_guitar(x3) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_rehearse(e1) & n_song(x2) & a_favorite(s1) & Theme(s1,x2) & of(x2,x1) & n_thing(x1) & n_man(x1) & card_eq_2(x1))