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- Congratulations! This post is now Staff Pick! Thank you for your wonderful contributions. Please, keep them coming!
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The answer is that at some point the font for this post was changed and a number of special symbols all got changed to ?. Fortunately, a very kind person on the stackexchange mathematica forum was able to dig out the original post from the internet archive:
Wayback Machine Happy Harmonic 2017 !
which does work - so relieved.
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