Added YouTube link (#31497)
Added a demonstration of backtracking via YouTube.
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[Geeks 4 Geeks](http://www.geeksforgeeks.org/backtracking-set-1-the-knights-tour-problem/)
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[A very interesting introduction to backtracking](https://www.hackerearth.com/practice/basic-programming/recursion/recursion-and-backtracking/tutorial/)
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[A YouTube demonstration](https://www.youtube.com/watch?v=gBC_Fd8EE8A)
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