A man wearing a Enrolling Stones t-shirt plays on his Yamaha keyboard.
The man is playing guitar.
A keyboard is different from a guitar.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6.(on(e2,x5) & n_keyboard(x5) & (x5 = x6) & ne_org_yamaha(x6) & of(x5,x1) & n_male(x1) & Actor(e2,x1) & v_play(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_t-shirt(x3) & (x3 = x4) & ne_nam_stones(x4) & a_enrolling(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2))