People in the city.
There are people in a city.
the city has people in it
exists x1 x2.(n_city(x2) & a_topic(x1) & in(x1,x2) & n_people(x1))
exists p1 x1 x2 x3.((x1 = x2) & in(x2,x3) & n_city(x3) & n_people(x2))