The Quarantine and Scrub add-on/plug-in is for changing existing trashed-out metadata, not for finding metadata variations as described in this thread. If you have thousands of (fiction) books with all of the metadata stuffed into the Author or the Title, for example, Q&S can sort it out and fix it for you. Finding variations is not at all what it is about.
I wrote Q&S to scrub clean and enhance the metadata for a 50,000 EPUB fiction library. A learning curve to do this is trivial compared to the effort to do each of 50,000 ebooks individually and serially.
The OP of this particular thread does not describe a scenario that cost-justifies using Q&S.
My Multi-Column Search plug-in used with some creativity is more appropriate for finding metadata variations than Q&S. See the the generic "Raw SQL Query Tab" functionality, and/or the "Final Filters" functionality.
DaltonST
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