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We present a model based on the gauge group SU(2) L SU(2) R SU(4) C with gauge couplings that are found to be unified at a scale M G near the string unification scale. The model breaks to the minimal supersymmetric standard model at a scale M I 10 12 GeV, which is instrumental in producing a neutrino in a mass range that can serve as hot dark matter...
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