Many dark-haired people are on the subway car.
The subway car is empty.
The subway car can't be full of people, while also being empty.
exists p1 s1 x1 x2 x3.(n_car(x2) & of(x2,x3) & n_subway(x3) & on(x1,x2) & n_people(x1) & a_dark-haired(s1) & Theme(s1,x1) & n_quantity(x1))
exists s1 x1 x2.(n_car(x1) & of(x1,x2) & n_subway(x2) & Theme(s1,x1) & a_empty(s1))