{% include "extras.html" ignore missing %}

Home · Lessons {% for slug, title in lessons %} {{title}} {% endfor %} · Appendices {% for slug, title in appendices %} {{title}} {% endfor %}

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{% if prev[0] %}⇐ {{prev[1]}}{% endif %}

{{title}} © 2025 the authors

{% if next[0] %}{{next[1]}} ⇒{% endif %}