https://docs.google.com/presentation/d/1OaoCS9t9Pp1OpBVborxTEZRHTErzVjgNduKVB23tdjs/edit?usp=sharing
https://docs.google.com/document/d/1dNmktGIU0DvaURmWmF5MCStUCeRWpnnF8jcZkbJca54/edit?usp=sharing