Abstract
One interesting way to extend the Standard Model is the hypothesis of bifermions which are bosons that couple to pairs of quarks and leptons. We point out that [Formula: see text] grand unification gives a natural way to classify bifermions and discuss leptoquarks, biquarks and bileptons. In fact, [Formula: see text] provides an ideal covering group as it contains all possible bifermions within a single model.
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