( ( The quarks ) ( ( ( clumped ( in threes ) ) ( to ( form ( ( protons and ) neutrons ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS quarks)) (VP (VBD clumped) (PP (IN in) (NP (NNS threes))) (S (VP (TO to) (VP (VB form) (NP (NNS protons) (CC and) (NNS neutrons)))))) (. .)))
The quarks clumped in threes to form protons and neutrons .
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS quarks)) (PP (IN in) (NP (DT each) (NN proton) (CC and) (NN neutron))))) (. .)))