Question: 21) using python write a function that removes all occurrences of a given letter from a string: For example: remove_letter(a, apple) will return pple. 22)

21) using python write a function that removes all occurrences of a given letter from a string: For example: remove_letter("a", "apple") will return "pple".

22) using python write a function that counts how many times a substring occurs in a string:For example: count("is", "Mississippi") will return 2.

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