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An example I have encountered is the following (e+ e- -> mu+ mu-):

test = SpinorUBar[k2, m2].GA[mu].SpinorV[k1, m2] SpinorU[p1, m1].GA[
    mu].SpinorVBar[p2, m1] FeynAmpDenominator[
   PropagatorDenominator[s]]
ctest = ComplexConjugate[test]
FermionSpinSum[test ctest]

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