The lights at night in the city.
The city is dark because of a blackout.
There can't be lights in a dark place.
exists x1 x2 x3.(n_city(x3) & n_light(x1) & a_topic(x1) & at(x1,x2) & in(x2,x3) & n_night(x2))
exists s1 x1 x2.(n_city(x1) & of(s1,x2) & n_blackout(x2) & r_because(s1) & Theme(s1,x1) & a_dark(s1))