A town and a green mountain in the back.
There are buildings.
A town has buildings.
exists s1 s2 x1 x2 x3.(n_back(x3) & a_topic(s1) & subset_of(x2,s1) & in(x2,x3) & n_mountain(x2) & a_green(s2) & Theme(s2,x2) & subset_of(x1,s1) & n_town(x1))
exists p1 x1 x2.((x1 = x2) & n_building(x2))