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We address two fundamental aspects of flavor physics: the mass hierarchy andthe large lepton mixing angles. On one side, left-right flavor symmetryrealizes the democratic mass matrix patterns and explains why one family ismuch heavier than the others. On the other side, discrete flavor symmetry suchas A4 leads to the observed tribimaximal mixing for the leptons. We show that,by explicitly breaking the left-right flavor symmetry into the diagonal A4, itis possible to explain both the observed charged fermion mass hierarchies andquark and lepton mixing angles. In particular we predict a heavy 3rd family,the tribimaximal mixing for the leptons, and we suggest a possible origin ofthe Cabibbo and other mixing angles for the quarks.

Embedding A4 into left-right flavor symmetry: Tribimaximal neutrino mixing and fermion hierarchy