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This work is based on "Opposed Piston Engine Mechanism" (https://sketchfab.com/3d-models/opposed-piston-engine-mechanism-5457fd510d54454085a548776397666d) by trinityscsp (https://sketchfab.com/trinityscsp) licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/)