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Use "leptons" in a sentence
"The most essential difference between quarks and leptons is that leptons are not affected by the strong force."
"If a fourth family of quarks and leptons is discovered, this may mean that the standard model must be revised and more extensive reconstruction within elementary-particle physics commenced."
"If a fourth family of quarks and leptons is discovered in the future, the Standard Model in its present form would need a revision and a major reconstruction of the theory of elementary particles could be called for."