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The chain rule.
Rule of three means when in drama the first time you want something to happen it does not work, then when you try the second time it does not work again, and the third time it works.
William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier.
If the rules for 2 and 3 work, the number is divisibale by 5.
The "2-deep" rule means that a building should have only the main distribution and the intermediate distribution that feeds the horizontal distribution to the work area.