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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/7726278
Be sure blackboards are completely erased of classified information.
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Be sure blackboards are completely erased of classified information.

Original public domain image from Library of Congress

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Public DomainFree CC0 image for Personal and Business use

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Editorial use only

Be sure blackboards are completely erased of classified information.

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