Three people sit waiting in a lobby.
Four people are walking around the lobby.
There are either three or four people.
exists e1 e2 x1 x2.(for(e1,e2) & in(e2,x2) & n_lobby(x2) & Actor(e2,x1) & v_wait(e2) & Actor(e1,x1) & v_sit(e1) & n_people(x1) & card_eq_3(x1))
exists e1 x1 x2.(n_lobby(x2) & around(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & card_eq_4(x1))