A man playing an instrument.
The man is sitting quietly.
The man is either sitting quietly, or playing an instrument.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_instrument(x3) & (x1 = x2) & n_man(x1))
exists e1 p1 x1.(n_man(x1) & exists s1.(Theme(s1,x1) & a_quietly(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_sit(e1))