Default theme implementation for rendering book outlines within a block.
This template is used only when the block is configured to "show block on all pages", which presents multiple independent books on all pages.
Available variables:
template_preprocess_book_all_books_block()
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Licensed under the GNU General Public License, version 2 and later.
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https://api.drupal.org/api/drupal/core!modules!book!templates!book-all-books-block.html.twig/8.1.x