( Helium ( ( is ( ( an example ) ( of ( a ( noble ( ( -LRB- ( inert -RRB- ) ) gas ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Helium)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ noble) (PRN (-LRB- -LRB-) (NP (NN inert)) (-RRB- -RRB-)) (NN gas))))) (. .)))
Helium is an example of a noble (inert) gas.
(ROOT (S (NP (NNP Neon)) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (JJ noble) (NN gas))))) (. .)))