https://docs.google.com/presentation/d/1lX11Z5mPW1gdvWEVVfSRdAml-bpItilz/edit?usp=sharing&ouid=113599354058816837340&rtpof=true&sd=true https://docs.google.com/presentation/d/1PkqRkypHr83RmsM53xC47VDPDv4j7OLT/edit?usp=sharing&ouid=113599354058816837340&rtpof=true&sd=true