PPT

PPT 1 

https://youtu.be/UHFqxOFlgFc?si=qMif1z77jGHc-F78

PPT2

https://youtu.be/4SONEFHjdPE?si=GwRNKYNMvYevrpE6 

PPT3 

https://youtu.be/sX3JeppqG_0?si=9SbepP3H9uH5J_-1