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Every solution breeds new problems.
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Friends come and go but enemies accumulate.
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A conclusion is the place where you get tired of thinking.
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Enough research will tend to support your conclusions.
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If you improve or tinker with something long enough, eventually it will break or malfunction.
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Every clarification breeds new questions.
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The Ninety-Ninety Rule of Project Schedules - the first ninety percent of the task takes ninety percent of the time, and the last ten percent takes the other ninety percent.
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A failure will not appear until a unit has passed final inspection.