( Each ( ( ( ( contains ( ( the ( same elements ) ) ( -LRB- ( ( ( ( ( ( carbon , ) hydrogen ) , ) and ) oxygen ) -RRB- ) ) ) ) though ) ( in ( different arrangements ) ) ) . ) )
(ROOT (S (NP (DT Each)) (VP (VBZ contains) (NP (NP (DT the) (JJ same) (NNS elements)) (PRN (-LRB- -LRB-) (NP (NP (NN carbon)) (, ,) (NP (NN hydrogen)) (, ,) (CC and) (NP (NN oxygen))) (-RRB- -RRB-))) (ADVP (RB though)) (PP (IN in) (NP (JJ different) (NNS arrangements)))) (. .)))
Each contains the same elements (carbon, hydrogen, and oxygen) though in different arrangements.
(ROOT (S (SBAR (IN Although) (S (NP (PRP they)) (VP (VBP differ) (ADVP (RB vastly)) (PP (IN in) (NP (NNS hardness)))))) (, ,) (NP (NP (NN pencil) (NN lead)) (CC and) (NP (NNS diamonds))) (DT both) (VP (VBP contain) (NP (NN carbon))) (. .)))