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This is a follow-up question to this previous question I asked.

Basically I asked for an environment that not only stores the parent equation value, but also the number of a subequation so a series of subequations could be stretched through a larger section of a document, like so (code reused from Werner's answer to the previous question):

enter image description here

There also has been a variant by egreg where one could decide the format of the subequation number when first defining a series of equations.

enter image description here

While these codes work fantastic, there are sometimes situations where I want to show something similar in a different way, e.g. two different ways of proving the same mathematical theorem, so I do not want to start a new equation series with a different equation number, but rather start a new series of subequations within an already existing equation series, so the equation number (in the following case 1) remains the same, while the format of the subequation number changes and re-counts, like so:

enter image description here

I tried adding this option to the codes I received through my previous question, but since I am new to LaTeX, I was not able to figure it out, although I did understand the codes provided by Werner and egreg at least partly.

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    You need to be more specific as to what you mean by "I do not want to change the parent equation number, but rather start a new series of subequations within this parent equation." Provide equation numbers that clarify it... even if you have to write it on a piece of paper and then take a picture. – Werner Mar 28 at 19:06
  • I tried to provide clarification in my recent edit. – jona173 Mar 28 at 19:26
  • While the question might be interesting from a TeXnical point of you, I guarantee you that numbering equations like 1.1, 1.a, 1.2, 2, 1.b will only confuse any reader. If this were a submitted paper and I were a referee, I would probably stop reading and send the paper back with a request for a proper numbering. – campa Mar 29 at 7:54

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