16-05 here
https://www.youtube.com/watch?v=0MyA059YFw8


https://www.youtube.com/watch?v=k4sOP_yBm9U


https://www.youtube.com/watch?v=pOHRaOs0WqA


https://www.youtube.com/watch?v=nTzsv8gYzVc




video1:
https://www.youtube.com/watch?v=0MyA059YFw8


video2:
https://www.youtube.com/watch?v=k4sOP_yBm9U


video3:
https://www.youtube.com/watch?v=pOHRaOs0WqA


video4:
https://www.youtube.com/watch?v=nTzsv8gYzVc









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Richard J. Sexton