A black dog chewing on a red leash.
A dog is white.
If the dog is black then it can't be white.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_leash(x3) & a_red(s2) & Theme(s2,x3) & Actor(e1,x2) & v_chew(e1) & (x1 = x2) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists s1 x1.(Theme(s1,x1) & a_white(s1) & n_dog(x1))