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In python, please provide details how to execute thanks! Write the following function (with comments but no screenshot of the execution) def letters(str1) that takes

In python, please provide details how to execute thanks!

Write the following function (with comments but no screenshot of the execution)

def letters(str1)

that takes a string argument str1 and returns a set of only letters (a-z and A-Z) that are contained in the string. 5 pts

Your code with comments

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