A city street is illuminated by lamps at night.
An empty street is lit by black lamps.
Not all streets are empty and not all lamps are black lamps
exists e1 x1 x2 x3 x4.(at(e1,x4) & n_night(x4) & Actor(e1,x3) & n_lamp(x3) & Theme(e1,x1) & v_illuminate(e1) & n_street(x1) & of(x1,x2) & n_city(x2))
exists e1 s1 s2 x1 x2.(Actor(e1,x2) & n_lamp(x2) & a_black(s2) & Theme(s2,x2) & Theme(e1,x1) & v_light(e1) & n_street(x1) & a_empty(s1) & Theme(s1,x1))