A group of people stare at a building.
There are no people around the building.
People is different than no people.
exists e1 x1 x2 x3.(at(e1,x3) & n_building(x3) & Actor(e1,x1) & v_stare(e1) & of(x1,x2) & n_people(x2) & n_group(x1))
exists p1 x1 x3.(n_building(x3) & -exists x2.((x1 = x2) & around(x2,x3) & n_people(x2)))