1-   https://www.youtube.com/watch?v=UiyR1cmdyoE

2- https://youtu.be/rDc0SzhbHuE

3- MIT open courses.com

4- https://www.youtube.com/watch?v=ZSFdOjxB-1I&t=12s

5- https://ocw.mit.edu/index.htm

6- https://youtu.be/19YkIk8HCKM

 

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