A young man plays the trumpet.
The man is playing a guitar.
The man is either playing the trumpet or a guitar.
exists e1 s1 x1 x2.(n_trumpet(x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2))