.. _double_elements_page: 

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Double edge, Double faces and Double volumes
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These mesh quality controls highlight the mesh elements basing on the same set of nodes.

.. image:: ../images/double_faces.png
	:align: center

In this picture some faces are coincident after copying all elements with translation with subsequent Merge of nodes.

**See also** a sample TUI Script of a :ref:`filter_double_elements` filters.
