A young man playing an electric guitar.
The man is playing the harmonica.
An electric guitar is not a harmonica.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & a_electric(s2) & Theme(s2,x3) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(n_harmonica(x2) & n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1))