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Formula on blackboard with chalk. Writing with chalk on a blackboard at the University.

Name: formula on blackboard with chalk. Writing with chalk on a blackboard at the University.
Uploaded: 2016-10-07
Duration: 8 s
Channel: tematopman
Description: formula on blackboard with chalk. Writing with chalk on a blackboard at the University.

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tematopman

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8.72s

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