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Eigen  3.4.90 (git rev e3e74001f7c4bf95f0dde572e8a08c5b2918a3ab)
#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.