https://docs.google.com/document/d/1d5KN9Opzu5BhU-MO89DxSnjqJ9SR_fmi2k4CMhdWpt0/edit?usp=sharing
https://docs.google.com/document/d/1gi8ki4r2-XPJt1045TvqOYqFxbxdxCKuoW8cGZ13T6w/edit?usp=sharing