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Storing Grain for Seven Years
Seven years of plenty at a fifth put by, then seven years of famine drawn down. It is the only computation in the book that is a time series, and the stock curve is the finding.
Reference: Genesis 41:33–57
The passage gives the fraction, the two seven-year spans, and the fact that the store outlasted the famine. It gives no harvest, no population and no spoilage rate. Those three are supplied here.