https://docs.google.com/document/d/1JmLUwxrla6GREc7rggizKqH5h65wvo6eBcmw8TTQRSg/edit?usp=sharing

Original writeup (https://docs.google.com/document/d/1JmLUwxrla6GREc7rggizKqH5h65wvo6eBcmw8TTQRSg/edit?usp=sharing).