-/*!
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-\page double_elements_page 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.
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-\image html double_faces.png
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-In this picture some faces are coincident after copying all elements
-with translation with subsequent Merge of nodes.
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-\sa A sample TUI Script of a \ref filter_double_elements "Filters of Double Elements".
-
-*/