A man is playing an organ.
a man is pressing keys
organ  refers to keys.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_organ(x2) & n_man(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_press(e1) & n_key(x2) & n_man(x1))