Cooks are working in a kitchen.
People are sitting on an airplane.
There is no kitchen in an airplane.
exists e1 x1 x2.(in(e1,x2) & n_kitchen(x2) & Actor(e1,x1) & v_work(e1) & n_cook(x1))
exists e1 x1 x2.(on(e1,x2) & n_airplane(x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))