There is a restaurant and all the tables are empty.
There is a restaurant with no customers.
no customers resembles that the tables are empty
exists p1 x1 x4.(n_table(x4) & all x3.((x3 = x4) -> exists s1.(Theme(s1,x3) & a_empty(s1))) & exists x2.((x1 = x2) & n_restaurant(x2)))
exists p1 x1 x2.(-exists x3.((x1 = x2) & with(x2,x3) & n_customer(x3)) & n_restaurant(x2))