A class full of students.
People are in a school
Students are people, and a class belongs to a school, so the people in a school must be the students in the classroom
exists s1 x1 x2 x3.(a_topic(x1) & of(s1,x3) & n_student(x3) & Theme(s1,x2) & a_full(s1) & (x1 = x2) & n_class(x1))
exists p1 x1.(exists x2.(in(x1,x2) & n_school(x2)) & n_people(x1))