People gathered in an artist's studio.
The studio is empty.
The studio cannot be empty if people are gathered there.
exists e1 x1 x2 x3.(in(e1,x3) & n_studio(x3) & of(x3,x2) & n_artist(x2) & Actor(e1,x1) & v_gather(e1) & n_people(x1))
exists s1 x1.(n_studio(x1) & Theme(s1,x1) & a_empty(s1))