The bear chases the dog. The bear needs the cat. The bear does not need the dog. The cat chases the dog. The cat is big. The cat needs the bear. The dog is cold. The dog needs the bear. The dog visits the bear. The dog visits the cat. If someone does not need the bear then the bear needs the cat. If someone chases the cat then they do not chase the dog.
The bear does not chase the bear.