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lang-mma
TraditionalForm[Expand[(x+a y+a^2 z)^3]/.a^n_->a^Mod[n,3], ParameterVariables->{a}]? $\endgroup$ParameterVariablesas "an option forGroebnerBasisandPolynomialReduce.") If you care to post your comment as an answer, I'll be glad to accept it as such. $\endgroup$