/usr/lib/python3/dist-packages/pyramid_jinja2/tests/templates/deep/sub/base.jinja2 is in python3-pyramid-jinja2 2.7+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | {% extends '../base.jinja2' %}
{% block content %}sub-base {% block subcontent %}{% endblock %}{% endblock %}
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