https://docs.google.com/presentation/d/143SJ3sz4W_oXU-rTW0AcifglUyv3-9eUzAbAtd98VJc/edit#slide=id.p
https://docs.google.com/presentation/d/143SJ3sz4W_oXU-rTW0AcifglUyv3-9eUzAbAtd98VJc/edit#slide=id.gb7d6bfe04a_0_0
https://docs.google.com/presentation/d/143SJ3sz4W_oXU-rTW0AcifglUyv3-9eUzAbAtd98VJc/edit#slide=id.gb7d6bfe04a_0_0