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When a system is tested with normal transactions, variations are added, including invalid data used to ensure that the system can properly detect errors.

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The IN key word is used to:



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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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