( ( a ( metallic solid ) ) ; )
(ROOT (NP (NP (DT a) (JJ metallic) (JJ solid)) (: ;)))
a metallic solid;
(ROOT (S (NP (JJ Metallic) (NNS solids)) (VP (VBP are) (VP (VBN composed) (ADVP (RB entirely)) (PP (IN of) (NP (JJ metallic) (NNS atoms))))) (. .)))