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Heuristics
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NuCS comes with some pre-defined :ref:`heuristics <heuristics>` and makes it possible to design custom heuristics.


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Custom heuristics
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NuCS makes it possible to define and use custom heuristics.

A heuristic needs to be registered before it is used.
The following code registers the :code:`SPLIT_LOW` heuristic.

.. code-block:: python
   :linenos:

   DOM_HEURISTIC_SPLIT_LOW = register_dom_heuristic(split_low_dom_heuristic)