The dog chases the lion. The lion visits the mouse. The mouse chases the dog. The rabbit chases the lion. If someone chases the rabbit and the rabbit chases the lion then they do not need the rabbit. If the mouse does not visit the rabbit then the rabbit visits the lion. If the lion visits the mouse then the mouse visits the dog. If someone chases the rabbit and the rabbit needs the dog then the rabbit chases the mouse. If the mouse visits the dog and the dog does not chase the mouse then the mouse chases the rabbit. If someone visits the dog then the dog does not need the rabbit. If someone is big and they do not chase the mouse then they do not visit the mouse. If someone is big and they do not visit the lion then they do not need the mouse.
The mouse does not need the dog.