8A, 8B, 8C, 8D
https://drive.google.com/file/d/1PCcifAZmbgnmPSbAqM6A82qtt5HZI9XX/view?usp=drive_link
Kwok's notes (just pay attention in class)
https://docs.google.com/document/d/1cckENrccOLle3lh4AJewWPekBSbUmk861S-wTxwJFxI/edit?usp=sharing
