Ppt

 https://docs.google.com/presentation/d/1z5EmyZS7o7zjRtD_orjkHeWS6qNFNp24/edit?usp=drivesdk&ouid=113648180638802974415&rtpof=true&sd=true https://docs.google.com/presentation/d/1z5EmyZS7o7zjRtD_orjkHeWS6qNFNp24/edit?usp=drivesdk&ouid=113648180638802974415&rtpof=true&sd=true