"One of the things I've been trying to do is look for simpler or rules underpinning good or bad design. I think one of the most valuable rules is avoid duplication. "Once and only once" is the Extreme Programming phrase."

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An exact poetic duplication of a man is for the poet a negation of the earth, an impossibility of being, even though his greatest desire is to speak to many men, to unite with them by means of harmonious verses about the truths of the mind or of things.

— Salvatore Quasimodo