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Why would a calculator cause feedback?
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It's not a calculator.
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It's a bug.
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A wireless R.F. Transmitter to be precise.
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Not to be confused
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with the more advanced infrared signal burst device.
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Book research?
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Nanny cam.
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So... Do you think that the robbery
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was just a pretense for the placement of the bug,
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and then the killer was caught in the act?
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Well, it's not Watergate, Castle.