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We recommend the notebook DOWNLOAD-DESKTOP-NOTEBOOK.nb, since its rendering of the mathematical notation is slightly better than that of the post. The notebook is available as an attachment near the end of the post.
Corrections to the code are available for download at https://github.com/carltape/mtbeach/blob/master/mathematica/elasticity/wolfram/CorrectionsForOurWolframCommunityPost.nb
