- Day21 8/9: https://hackmd.io/Awo34rhdQfay7Ay6LnT3Hw
- Day22 8/10: https://hackmd.io/XEOoPgzkRBmLXxyPQD4QLw
- Day23 8/11: https://hackmd.io/JxbHQTcfQaq0W1rp-LJqAg