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pen
Description
A white pen with a red tip moves across a sheet of graph paper, writing mathematical equations and expressions, while a printed worksheet with Russian text and a graph lies in the background on a light green surface.
Sources
![[*]_[*]](https://media.coub.com/assets/01a0919e-ca96-77ea-8bca-9627ddc21e0f/g-e85122cc-31b5-40fe-a1c9-b1a4052a8221/coub-poster.jpg?v=1789149520)
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