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Hey Mohamed. It's been a while since going through the course, but I recall encountering something like this as well. I'd try re-watching the video and make sure each one shows as completed. For me, I think the issue is for some of the lesson videos I'd watch them at 1.5X or 2X speed, and it didn't seem to think I finished the lesson unless I went through it at 1X speed so that it would show as completed.
Your situation may be different, but it may help you to move forward.
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