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/usr/include/octave-4.0.0/octave/mx-m-pm.h is in liboctave-dev 4.0.0-3ubuntu9.

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// DO NOT EDIT -- generated by mk-ops
#if !defined (octave_mx_m_pm_h)
#define octave_mx_m_pm_h 1
#include "dMatrix.h"
#include "PermMatrix.h"
#include "mx-op-decl.h"
MPM_BIN_OP_DECLS (Matrix, Matrix, PermMatrix, OCTAVE_API)
#endif