A brown dog in a field.
A black dog is in the barn.
The dog is brown, it cannot also be black.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_field(x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists p1 s1 x1 x2.(n_barn(x2) & in(x1,x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))