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Exercises
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.. toctree::
   :hidden:

   basic/index
   intermediate/index
   advanced/index
   solutions/index
   

.. rst-class:: strong-references

  * The :doc:`basic <basic/index>` exercises are very brief examples very short identifiers and focus und 
  * :doc:`intermediate/index`
  * :doc:`advanced/index`
  * :doc:`solutions/index`