Four people sit on the steps of the entrance to a building.
Four people sit on the steps of the entrance of a building waiting for their friend.
People sitting on steps are not necessarily waiting for a friend.
exists e1 x1 x2 x3 x4.(n_entrance(x3) & n_step(x2) & on(e1,x2) & to(x2,x4) & n_building(x4) & of(x2,x3) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))
exists e2 e1 x1 x2 x3 x4 x5.(n_friend(x5) & of(x5,x3) & n_thing(x3) & n_entrance(x3) & n_step(x2) & for(e1,e2) & for(e2,x5) & Actor(e2,x1) & v_wait(e2) & on(e1,x2) & of(x2,x3) & of(x3,x4) & n_building(x4) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_4(x1))