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We propose a model in which $A_4$ Family Symmetry arises dynamically from asix dimensional orbifold SU(5) Supersymmetric Grand Unified Theory. The SU(5)is broken to the Standard Model gauge group by a particular orbifoldcompactification leading to $A_4$ Family Symmetry, low energy Supersymmetry andHiggs doublet-triplet splitting. The resulting four dimensional effectivesuperpotential leads to a realistic description of quark and lepton masses andmixing angles including tri-bimaximal neutrino mixing and an inter-family masshierarchy provided by a Froggatt-Nielsen mechanism. This model is the firstwhich combines the idea of orbifold GUTs with $A_4$ family symmetry resultingfrom the orbifolding.

$A_4$ Family Symmetry from SU(5) SUSY GUTs in 6d