A man is playing a musical instrument.
man playing
Man playing can be inferred.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & a_musical(s1) & Theme(s1,x2) & n_man(x1))
exists x1 x2.(n_playing(x1) & of(x1,x2) & n_man(x2) & a_topic(x1))