Hey, Mark, good answers, relating it back to known ideas always helps understanding. I've been a technology tutor and getting people over the hurdle to new ideas is never easy.
And to Julianv, welcome along. Glad to hear you've enjoyed and learned from the discussion. Feel free to ask more or clarify things so that this clever lot can give more answers. ( I excuse myself from the 'clever' bit, I am still learning too )
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