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Starting from the recent U(3) U(3) gauge model of strong interactions, we discuss the very natural synthesis with Weinberg's model of leptons. As a result of the interplay of the two models (a) neutral ΔS=1 currents are eliminated without enlarging the number of quarks, and (b) a natural (3,3̄)(3,3̄) symmetry breaking emerges for the hadrons. Incorporation of alternative lepton theories is mentioned.
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Bars et al. (1972) studied this question.
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