"If I was a locksmith, I'd be pimping that out man. I'll trade you a free key duplication for. That joke made me laugh before I could finish it, which is good, because it had no ending."

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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.

— Martin Fowler