The bear eats the lion. The bear is blue. The cow chases the bear. The dog is not blue. The lion does not eat the dog. The lion needs the bear. The lion needs the dog. If something chases the dog and it is not green then it does not need the dog. If something does not eat the lion then the lion eats the cow. If something needs the bear and it is not green then the bear chases the dog.
The lion chases the cow.