A gray-haired man singing in a crowd and playing an acoustic guitar.
The man is playing an electric guitar.
An electric guitar is not the same as an acoustic guitar.
exists e2 e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_guitar(x5) & a_acoustic(s2) & Theme(s2,x5) & (x1 = x4) & in(e1,x3) & n_crowd(x3) & Actor(e1,x2) & v_sing(e1) & (x1 = x2) & n_man(x1) & a_gray-haired(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_electric(s1) & Theme(s1,x2))