An orchestra in a large room.
the room is small
Small and large are different.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_room(x2) & a_large(s1) & Theme(s1,x2) & n_orchestra(x1))
exists s1 x1.(n_room(x1) & Theme(s1,x1) & a_small(s1))