A restaurant worker is cleaning a seat.
The waitress is cleaning a seat.
Not every waitress is cleaning a seat needed to be a restaurant worker
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_clean(e1) & n_seat(x3) & n_worker(x1) & of(x1,x2) & n_restaurant(x2))
exists e1 x1 x2.(n_waitress(x1) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & n_seat(x2))