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I duplicated the book. Then in the title, I added a colon followed by the series. I repeated it on the second book following the colon with the second series. That way when I do a search for duplicates, I can see that they are part of 2 series. Then just add the series in the series section as you would if they were separate titles. This was a suggestion way back in the Calibre forum questions and was the simplest solution for me.
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