A man and a woman on a path.
A man and a dog on a path.
A woman can't also be a dog.
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_woman(x2) & subset_of(x1,s1) & n_man(x1))
exists s1 x1 x2 x3.(a_topic(s1) & subset_of(x2,s1) & on(x2,x3) & n_path(x3) & n_dog(x2) & subset_of(x1,s1) & n_man(x1))