Two students at work in a science class.
They are in a lab
It cannot be inferred that the students are in a lab.
exists x1 x2 x3 x4.(a_topic(x1) & at(x1,x2) & in(x2,x3) & n_class(x3) & of(x3,x4) & n_science(x4) & n_work(x2) & n_student(x1) & card_eq_2(x1))
exists p1 x1.(n_thing(x1) & exists x2.(in(x1,x2) & n_lab(x2)))