NetfabbTetrahedronCorrected.x3d using X_ITE

X_ITE X3D Browser   Corrected version of exported model: test Netfabb import and export with simplest mesh closed solid.

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     Original X3D model: NetfabbTetrahedronCorrected.x3d
X3D Examples Archive: https://www.web3d.org/x3d/content/examples/X3dForAdvancedModeling/Conversions/NetfabbTetrahedronCorrectedIndex.html

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