Two guys at a bar one dark-skinned and one light-skinned.
Two guys at a bar one dark-skinned and one light-skinned drink beer.
We don't know that the people drink beer.
exists s1 x1 x2 x3 x4 x5.(a_topic(x1) & at(x1,x2) & n_thing(x4) & card_eq_1(x4) & n_dark-skinned(x3) & card_eq_1(x3) & of(x3,x5) & n_bar(x5) & subset_of(x4,x2) & subset_of(x3,x2) & a_light-skinned(s1) & Theme(s1,x2) & n_guy(x1) & card_eq_2(x1))
exists s1 s2 x1 x2 x3 x4.(a_topic(x1) & at(x1,x2) & n_beer(x2) & of(x2,x4) & n_drink(x4) & a_light-skinned(s2) & Theme(s2,x2) & card_eq_1(x2) & card_eq_1(x2) & a_dark-skinned(s1) & Theme(s1,x2) & of(x2,x3) & n_bar(x3) & n_guy(x1) & card_eq_2(x1))