What have you tried?
This is not a code-writing service; it's a tutorial, in the sense used by the British U.
Cf: On asking for help and How do I post a question effectively?
Update: I asked AnomalousMonk for a suggestion for better phrasing of what even I knew (at the time) to be fair game for requests to distinguish the "tutorial" in para 2 from the sense of "tutorial" at Wossamotta U. He offered an excellent response:
Maybe something like "... a tutorial, in the sense used by the British U, i.e., a collegiate effort at self-directed learning — and we, your colleagues, are here to help your effort."
Please direct any further upvotes to Re^2: How to add missing part in a Hash of Array and its author!
Quis custodiet ipsos custodes. Juvenal, Satires
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