Two firemen are standing by a firetruck.
The men are sitting on a couch.
The men can be standing or sitting, not both.
exists e1 x1 x2.(by(e1,x2) & n_firetruck(x2) & Actor(e1,x1) & v_stand(e1) & n_fireman(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_man(x1) & on(e1,x2) & n_couch(x2) & Actor(e1,x1) & v_sit(e1))