Within supersymmetric SU(5) Grand Unified Theory, we present several newscenarios with anomaly free flavor symmetry U(1)_F. Within each scenario, avariety of cases offer many possibilities for phenomenologically interestingmodel building. We present three concrete and economical models with anomalyfree U(1)_F leading to natural understanding of observed hierarchies betweencharged fermion masses and CKM mixing angles.
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