I very much doubt there is a much of a need to support multiple series for the exact same rendition of an ebook.
Please cite multiple examples of a specific epub2 ebooks that are in two or more "series" at the same time. Please remember the ebook text in question must not be a later revised text use in a later series. Also note, that a specific ebook text can be parts of different collections but this is not the same as being parts of different series at the same time. Having a series change its name over time is not the same thing either.
I would be interested to see just how pervasive the need to support multiple "series" for a specific rendition of a text really is.
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