{% for collection in book.versions[-1].children_collections if not collection.is_root and not collection.is_deleted %}
{% if not collection.is_leaf %}
{% for sub_collection in collection.children if not sub_collection.is_deleted%}
-
-
-
{% for section in sub_collection.active_sections %}
-
-
{% endfor %}
{% endfor %}
{% else %}
{% for section in collection.active_sections %}
-
-
{% endfor %}
{% endif %}