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The Standard Model answers many of the questions about the structure and stability of matter with its six types of quarks, six types of leptons, and four force types, using an animated atom model, hypertext link, and illustrations.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types)) (PP (IN of) (NP (NNS leptons))))) (. .)))