Associated Taxonomy 1:
Associated Taxonomy 2:
For each universe show the books grouped by their series.
Note: Unlike in the screenshot, the code below ensures that if there are no books in a series, the series name will not appear. Also, as can be seen, books were present only in one series for each universe at the time I worked on the site.
Here's the PHP code for this (code inside the function can be used in any WordPress theme):
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