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The standard Model Group is SU(3)*SU(2)*U(1) i know that there is 3 families and each family contain 16 fermion. I am trying to guess the number of families and fermions from the representation of the concerned group. For example the SO(10) How many generations we have and how may fermions? I will be so thankful if any one could help me to find a criteria to study that in a simple way

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# A Generations of fermions

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