two men and a woman at the top of a flight of stairs
The people are on the stairs.
Two men and a woman are people.
exists s1 x1 x2 x3 x4 x5.(n_top(x3) & a_topic(s1) & subset_of(x2,s1) & at(x2,x3) & of(x3,x4) & of(x4,x5) & n_stair(x5) & n_flight(x4) & n_woman(x2) & subset_of(x1,s1) & n_man(x1) & card_eq_2(x1))
exists p1 x1 x2.(n_stair(x2) & n_people(x1) & on(x1,x2))