Two adults on cellphones downtown.
Two people are play basketball.
People who play basketball cant be on cellphones 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 p1 x1.(exists x2 x3.((x1 = x2) & Time(x2,x3) & n_basketball(x3) & n_play(x2)) & n_people(x1) & card_eq_2(x1))