( ( For example ) ( , ( ( ( the ( ( most common ) variety ) ) ( of carbon ) ) ( ( has ( ( ( ( six neutrons ) , ) ( ( in addition ) to ) ) ( its ( six protons ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN example))) (, ,) (NP (NP (DT the) (ADJP (RBS most) (JJ common)) (NN variety)) (PP (IN of) (NP (NN carbon)))) (VP (VBZ has) (NP (NP (CD six) (NNS neutrons)) (, ,) (CONJP (IN in) (NN addition) (TO to)) (NP (PRP$ its) (CD six) (NNS protons)))) (. .)))
For example, the most common variety of carbon has six neutrons, in addition to its six protons.
(ROOT (S (NP (NNP Carbon) (NNS atoms)) (VP (VBP have) (NP (NP (CD six) (NNS neutrons)) (CONJP (RB as) (RB well) (IN as)) (NP (CD six) (NNS protons)))) (. .)))