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Eigen  3.4.99 (git rev 199c5f2b47eb1f8e5a2d20e60f07e97cd95a6ba6)
#include <Eigen/MetisSupport>

This module defines an interface to the METIS reordering package (http://glaros.dtc.umn.edu/gkhome/views/metis). It can be used just as any other built-in method as explained in here.