.. include:: cutted/calculating_covariants_before_collapsible/calculating_covariants_before_collapsible.rst

..  admonition:: Preliminaries
   :class: toggle
 
   .. include:: cutted/calculating_covariants_collapsible/calculating_covariants_collapsible.rst

.. include:: cutted/calculating_covariants_after_collapsible/calculating_covariants_after_collapsible.rst