Question: 5. Write a Python function, call it dup(s), that returns 'Yes' if string s has a duplicate character, and 'No' otherwise. For instance, dup('abca') should

5. Write a Python function, call it dup(s), that returns 'Yes' if string s has a duplicate character, and 'No' otherwise. For instance, dup('abca') should return 'Yes', and dup('abcd ef') should return 'No'.

6. Write a function PrintThree(s) that prints out a string s, three characters at a time. Remember that len(s) returns the length of a string.

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