https://docs.google.com/presentation/d/1bsbBxpwBoHMYg5cpfVKk1wKKcbJnjPt5/edit?usp=sharing&ouid=115752960614001975546&rtpof=true&sd=true
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https://docs.google.com/presentation/d/19HK0mbpGdMcCgEy1rnoROH0AagtXHKFg/edit?usp=sharing&ouid=115752960614001975546&rtpof=true&sd=true