Two men are holding guitars.
The men are playing music.
WE DON'T KNOW THAT THE TWO MEN ARE PLAYING MUSIC.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_guitar(x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2))