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all you need to do is have an open circuit that ca be easily closed. think back to like elementary school science class, or your most recent terror training camp and imagine those clothespin switches. you know, a couple thumbtacks poked into the inside grips of a wooden clothespin, stick piece of cardboard in between them, when you pull it out your lightbulb comes on, the gps is activated, or the package explodes. apply that premise....
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