( ( conducting ( ( ( ( ( ( polymers , ) and ) superconductors ) -RRB- ) and ) ( solids ( -LRB- ( ( ( ( ( ( ( ( ( ( metals , ) magnets ) , ) ceramics ) , ) minerals ) , ) and ) glasses ) -RRB- ) ) ) ) ) . )
(ROOT (S (VP (VBG conducting) (NP (NP (NP (NNS polymers)) (, ,) (CC and) (NP (NNS superconductors)) (-RRB- -RRB-)) (CC and) (NP (NP (NNS solids)) (PRN (-LRB- -LRB-) (NP (NP (NNS metals)) (, ,) (NP (NNS magnets)) (, ,) (NP (NNS ceramics)) (, ,) (NP (NNS minerals)) (, ,) (CC and) (NP (NNS glasses))) (-RRB- -RRB-))))) (. .)))
conducting polymers, and superconductors) and solids (metals, magnets, ceramics, minerals, and glasses).
(ROOT (S (NP (DT A) (NN mineral)) (VP (VBZ is) (VP (VBN described) (PP (IN as) (NP (NP (DT a) (JJ solid) (JJ natural) (NN material)) (PP (IN with) (NP (DT a) (NN crystal) (NN structure))))))) (. .)))