See Western and https://docs.google.com/document/d/1QVxpBKI90ZHogxGM6nP8nPr7fhOhW8vyJ3yAi9dU9uc/edit or https://docs.google.com/document/d/1x2qa4tIcMB_6lb6epkXdQWFsrq38Yu-gkDsJSnjMs54/edit