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. 2022 Oct 17;8(10):286. doi: 10.3390/jimaging8100286

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Comparing each inward normal with vector $\vec{P_{0} P_{1}}$ .