A group of people protest with blue and white signs.
They are students
Not all people are students.
exists s1 s2 x1 x2 x3.(a_topic(x1) & of(x1,x2) & n_protest(x2) & with(x2,x3) & n_sign(x3) & a_white(s2) & Theme(s2,x3) & a_blue(s1) & Theme(s1,x3) & n_people(x2) & n_group(x1))
exists p1 x1.(n_thing(x1) & exists x2.((x1 = x2) & n_student(x2)))