Two adults on cellphones downtown.
The two adults are on their tablets.
cellphones is different from a tablets.
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 x2.(n_tablet(x2) & of(x2,x1) & n_thing(x1) & n_adult(x1) & card_eq_2(x1) & on(x1,x2))