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I tried your code and with 3 changes it works for me.
The first change is in the driver. I have no collections attributes. However, the check used an 'and' where I think you want an 'or' because it required me to define some.
The second is in books. Because of how python handles references, collections_attributes had %template% appended to it for each book. That caused the template to be executed more than once per book
The third is in books. For the reasons I mentioned above, I can't use comma as the template separator (my authors are LN, FN). I changed it to what I was using, ':@:'
The files are attached.
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