A man in medieval armor rides atop a horse.
The horse is black.
Not all horses are black.
exists e1 s1 x1 x2 x3.(atop(e1,x3) & n_horse(x3) & Actor(e1,x1) & v_ride(e1) & in(x1,x2) & n_armor(x2) & a_medieval(s1) & Theme(s1,x2) & n_man(x1))
exists s1 x1.(n_horse(x1) & Theme(s1,x1) & a_black(s1))