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Online at
https://www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Siggraph98Course/ColumnsIndex.html
-->
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Version control at
https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/content/examples/Vrml2Sourcebook/Siggraph98Course/Columns.x3d
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