week two


https://docs.google.com/presentation/d/1IusCiJL5AuWkZoWZId6qd63cCU-XVUUNpiCuax9ofQQ/edit?usp=sharing


https://docs.google.com/presentation/d/1VOUEvfISYqtnS0CCu3vVdAtFQpQPD9527Ux1dIXP4qs/edit?usp=sharing

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