The bear does not chase the tiger. The bear is big. The bear is round. The cow chases the bear. The cow is big. The cow sees the lion. The lion does not chase the cow. The lion chases the tiger. The lion is round. The lion needs the cow. The lion needs the tiger. The lion sees the cow. The tiger needs the cow. The tiger needs the lion. The tiger sees the bear. The tiger sees the lion. If someone sees the lion then they chase the cow. If someone chases the bear then the bear sees the lion.
The cow does not chase the cow.