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A small space having two sets of interlocking doors; the first set of doors must close before the second set opens. Typically authentication is required for each door - often using different factors. For example - a smart card may open the first door

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1. A small space having two sets of interlocking doors; the first set of doors must close before the second set opens. Typically authentication is required for each door - often using different factors. For example - a smart card may open the first door





 
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