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Hmm. The answers, and the OP code, are all so different, and return somewhat different data, that I'm getting a bit fuzzy on which method's data is the most correct. Perhaps a survey answer is needed, starting from a minimal test system, and adding programs a few at a time to see how and when the output vary.agc– agc2018-09-26 20:24:59 +00:00Commented Sep 26, 2018 at 20:24
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