user: What is Chichen Itza?

assistant: Chichén Itzá was one of the largest Maya cities which was a major focal point around AD 900. It is now one of the most visited archeological sites in Mexico.

user: Extract which animals Waddell played with and which ones he fought with from the text. Separate them with a comma, putting the ones he played with first.

assistant: puppies, alligators

user: List all the people mentioned in this paragraph on the history of Unix

assistant: - Brian Kernighan
- Dennis Ritchie
- Doug McIlroy
- Ken Thompson