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Well, how would you do this "by hand" without a computer or code? Write out what you're trying to do, in English, in specific steps. Pretend you have a friend who has no idea how to figure out how...

That's not how this works. We are not a homework service. What have you done so far? Where are you stuck? Please read the link in my signature on asking smart questions, then post an SSCCE with a...