https://www.geeksforgeeks.org/list-methods-in-python-set-2-del-remove-sort-insert-pop-extend/------------------------------------------------- https://www.geeksforgeeks.org/list-methods-in-python-set-1-in-not-in-len-min-max/
https://www.geeksforgeeks.org/python-dictionary/ https://www.geeksforgeeks.org/python-list-index/
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