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/usr/share/doc/cadabra/properties/SelfNonCommuting.tex is in cadabra 1.29-1ubuntu1.

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\cdbproperty{SelfNonCommuting}{}

Used to make objects with indices non-commuting when their index
values are different. See \subsprop{SelfAntiCommuting} for more
information.

\cdbseealgo{SelfAntiCommuting}