Assertion: lepton | /r/HasProperty | a family of particles
Facets:
Source sentences:
text: They are a family of particles that are different from the other known family of fermions, the quarks.
text: They are a family of particles that are different from the other known family of fermions, the quarks.
text: They are a family of particles that are different from the other known family of fermions, the quarks.