The cat chases the dog. The dog is not blue. The mouse needs the dog. The tiger sees the cat. If someone needs the cat and they do not chase the dog then they need the mouse. If someone does not see the dog and the dog does not see the cat then they do not need the mouse. If someone is green then they do not chase the mouse. If someone sees the dog then the dog is green. If someone is not green then they do not see the dog. If someone is not green then they see the mouse.
The cat chases the cat.