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+# ABC
+{:.no_toc}
+
+<nav markdown="1" class="toc-class">
+* TOC
+{:toc}
+</nav>
+
+## Top
+
+Questions to [David Rotermund](mailto:davrot@uni-bremen.de)
+
+{: .topic-optional}
+This is an optional topic!
+
+
+```python
+```
+
+
+```shell
+```