FLAT unit-4 Notes

https://drive.google.com/file/d/1hCd0JR6I7sTEtze2dKiORvzW7fqGNBgx/view?usp=sharing https://drive.google.com/file/d/1GLZZ9vxHbJO5GLZuxGtnd7sQSagtBqAi/view?usp=sharing

https://drive.google.com/file/d/14G-Lysdvz0zycvI0fiaxMZHspr4bq5FF/view?usp=sharing