Two science students work together on their laboratory assignment.
Two professors work on their research.
Students are not the same people as professors.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & n_assignment(x3) & of(x3,x4) & n_laboratory(x4) & of(x3,x1) & n_thing(x1) & a_together(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & n_student(x1) & of(x1,x2) & n_science(x2) & card_eq_2(x1))
exists e1 x1 x2.(on(e1,x2) & n_research(x2) & of(x2,x1) & n_thing(x1) & Actor(e1,x1) & v_work(e1) & n_professor(x1) & card_eq_2(x1))