The bear chases the dog. The bear is blue. The bear is green. The bear is young. The bear needs the dog. The bear sees the dog. The dog is green. The dog is young. The dog needs the bear. The dog sees the bear. If something sees the bear and the bear chases the dog then it sees the dog. If the dog is young and the dog is green then the dog is blue. If something is red then it chases the dog.
The bear does not need the bear.