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Supersymmetry is such a theory that proposes an extension to spacetime which allows for a symmetry relating the two groups of fundamental particles: fermions and bosons. Associated with this extension is a quantum number R_p defined as  R_p $R_p  = (-1)^(3B + L + 2S) 2S)$  where S, B, and L, are the spin, baryon, and lepton quantum numbers of the particle [LEP].