A man is sitting on a black and brown dog.
The dog is white.
The dog is black and brown therefore cannot be white.
exists e1 s1 s2 x1 x2.(on(e1,x2) & n_dog(x2) & a_brown(s2) & Theme(s2,x2) & a_black(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_man(x1))
exists s1 x1.(n_dog(x1) & Theme(s1,x1) & a_white(s1))