Two firefighters look at a building.
Two firefighters look at a burnt building.
Not all buildings are burnt.
exists e1 x1 x2.(at(e1,x2) & n_building(x2) & Actor(e1,x1) & v_look(e1) & n_firefighter(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(at(e1,x2) & n_building(x2) & a_burnt(s1) & Theme(s1,x2) & Actor(e1,x1) & v_look(e1) & n_firefighter(x1) & card_eq_2(x1))