A man playing the violin in the street.
The man does not have a musical instrument.
The one playing the violin cannot be the one who does not have a musical instrument.
exists e1 x1 x2 x3 x4.(n_street(x4) & n_violin(x3) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & (x1 = x2) & n_man(x1))
exists x1.(n_man(x1) & -exists e1 s1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_have(e1) & n_instrument(x2) & a_musical(s1) & Theme(s1,x2)))