How to rewrite my expression using two abbreviations?

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I tried Rewrite Expression Using Abbreviations example in https://au.mathworks.com/help/symbolic/subexpr.html for subexpr() and I can't reproduce it - the code renders a new expression with sigma, but w/o sigma1 and sigma2.
This is a link to the answer to my another question that uses two abbreviations (sigma1 and sigma2):
How do I get this result in MATLAB?
  2 Comments
Valeri Aronov
Valeri Aronov on 29 Jun 2021
Both refs above have greek sigmas rendered as in https://en.m.wikipedia.org/wiki/Greek_letters_used_in_mathematics,_science,_and_engineering

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Accepted Answer

Walter Roberson
Walter Roberson on 29 Jun 2021
You get the pretty output only with Live Script
  11 Comments
Valeri Aronov
Valeri Aronov on 4 Jul 2021
A loosely-typed language like that may become challenging for a casual user like myself. I would say that the prompt help available from MATLAB gurus is a crucial piece of MATLAB usefulness. Thanks a lot.

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