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Containers
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By *container* we mean the physical element that can contain a set of trays and materials inside them.

In the library you will find a class called ``TrayContainer``.
This is a superclass that is used as an abstract class.
So you should instantiate it, but you must implement its children (``Column`` and ``Carousel``).

.. toctree::
   :maxdepth: 1

   column
   carousel