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 lecture： https://learn-us-east-1-prod-fleet01-xythos.s3.us-east-1.amazonaws.com/5ddc0af50a34e/5108454?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Unit%25203%2520Lecture.mp4&response-content-type=video%2Fmp4&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200428T080144Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=AKIAZH6WM4PLTYPZRQMY%2F20200428%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=81f71fb7f2388b1d3e3fe631d9aaec17b131d872a956017c1102013ff976814b assignment overview videos： https://learn-us-east-1-prod-fleet01-xythos.s3.us-east-1.amazonaws.com/5ddc0af50a34e/5108470?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Week%25203_BehaviorChangeProject.mp4&response-content-type=video%2Fmp4&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200428T075247Z&X-Amz-SignedHeaders=host&X-Amz-Expires=21600&X-Amz-Credential=AKIAZH6WM4PLTYPZRQMY%2F20200428%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=3697a608d413d0842f63c2a97e87a66a88de333ba55f407c67355099db1bdc06