Two adults on cellphones downtown.
Neither of the people have a phone with them.
People cannot both be on cellphones but not have a phone with them
exists x1 x2 x3.(a_topic(x1) & on(x1,x2) & n_downtown(x2) & of(x2,x3) & n_cellphone(x3) & n_adult(x1) & card_eq_2(x1))
exists x2.(n_thing(x2) & n_people(x2) & -exists e1 x1 x3.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & with(x3,x2) & n_phone(x3) & of(x1,x2) & n_thing(x1)))