A carnival ride with five people on it.
The carnival ride is empty.
If a carnival ride has five people on it then it is not empty.
exists s1 x1 x2.(a_topic(x1) & with(x1,x2) & on(x2,x1) & n_thing(x1) & n_people(x2) & card_eq_5(x2) & n_ride(x1) & a_carnival(s1) & Theme(s1,x1))
exists s1 s2 x1.(n_ride(x1) & a_carnival(s1) & Theme(s1,x1) & Theme(s2,x1) & a_empty(s2))