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____ use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks through the doorway some beams are activated.

____ use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks through the doorway some beams are activated.
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____ use multiple infrared beams that are aimed across a doorway and positioned so that as a person walks through the doorway some beams are activated.

User Myz
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Workers is the answer!
User Vaviloff
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