.. colors
.. ===========================

.. role:: green
.. role:: red


.. general useful commands
.. ===========================

.. |pause| raw:: latex

   \pause

.. |small| raw:: latex

   {\small

.. |end_small| raw:: latex

   }


.. closed bracket
.. ===========================

.. |>| raw:: latex

   }


.. example block
.. ===========================

.. |example<| raw:: latex

   \begin{exampleblock}{


.. |end_example| raw:: latex

   \end{exampleblock}



.. alert block
.. ===========================

.. |alert<| raw:: latex

   \begin{alertblock}{


.. |end_alert| raw:: latex

   \end{alertblock}



.. columns
.. ===========================

.. |column1| raw:: latex

   \begin{columns}
      \begin{column}{0.45\textwidth}

.. |column2| raw:: latex

      \end{column}
      \begin{column}{0.45\textwidth}


.. |end_columns| raw:: latex

      \end{column}
   \end{columns}