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https://docs.google.com/presentation/d/1RyXFsy0WL7vNzsKEOpGC77u0B9bDJ3VxY2uyQvCpQgQ/edit?usp=sharing
https://docs.google.com/presentation/d/1RbKdeRvaAKbIAqGMSVuZQWoAvm1bC24L-QvKM4z06bQ/edit?usp=sharing