| http://www.w3.org/ns/prov#value | - And of course, if one is willing to forget the fact that the quantum-chromodynamical charge of quarks does make them different, then the picture is even tidier: 12 fermions, six of them quarks and six of them leptons, arranged in three families of four.Tidy or not, the two-digit number of matter fields in the standard model may suggest that these bodies are not, in fact, elementary.
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