https://docs.google.com/document/d/1IW0FQGjFgHblX6RvFVMlhRq22qO4VEmX9gnV66zpmm4/edit?usp=sharing
https://docs.google.com/document/d/11h0o7wuTwaL50j4TaDFRz8nCWYuzTLlmcar5ZTYgmYQ/edit?usp=sharing