https://www.youtube.com/watch?v=BuQai-9PdsY&list=PL0XPxycwHlvJ9XEDcrGfnqbNE9gOyqgtb&index=4
https://www.youtube.com/watch?v=q2QljxCW010&list=PL0XPxycwHlvJ9XEDcrGfnqbNE9gOyqgtb&index=5
Collection Optimistic-Change
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