( For ( ( some ( reason nature ) ) ( ( has ( elected ( to ( ( ( ( ( replicate ( this ( first generation ) ) ) ( of ( ( quarks and ) leptons ) ) ) ( to ( produce ( ( a total ) ( of ( ( ( six quarks ) and ) ( six leptons ) ) ) ) ) ) ) , ) ( with ( increasing mass ) ) ) ) ) ) . ) ) )
(ROOT (S (IN For) (NP (DT some) (NN reason) (NN nature)) (VP (VBZ has) (VP (VBN elected) (S (VP (TO to) (VP (VB replicate) (NP (DT this) (JJ first) (NN generation)) (PP (IN of) (NP (NNS quarks) (CC and) (NNS leptons))) (S (VP (TO to) (VP (VB produce) (NP (NP (DT a) (NN total)) (PP (IN of) (NP (NP (CD six) (NNS quarks)) (CC and) (NP (CD six) (NNS leptons)))))))) (, ,) (PP (IN with) (NP (VBG increasing) (NN mass)))))))) (. .)))
For some reason nature has elected to replicate this first generation of quarks and leptons to produce a total of six quarks and six leptons, with increasing mass.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types)) (PP (IN of) (NP (NNS leptons))))) (. .)))