( ( One example ) ( ( would ( be ( ( a mixture ) ( of ( ( pencil ( ( lead and ) diamonds ) ) ( -LRB- ( ( both carbon ) -RRB- ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD One) (NN example)) (VP (MD would) (VP (VB be) (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NP (NN pencil) (NN lead) (CC and) (NNS diamonds)) (PRN (-LRB- -LRB-) (NP (DT both) (NN carbon)) (-RRB- -RRB-))))))) (. .)))
One example would be a mixture of pencil lead and diamonds (both carbon).
(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))) (. .)))