Two adults on cellphones downtown.
Two people are playing chess.
People playing chess and being on cellphones downtown can't occur at the same time
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 e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_chess(x2) & n_people(x1) & card_eq_2(x1))