( Crystalline ( ( Solids 4 ) . ) )
(ROOT (S (NP (NNP Crystalline)) (VP (VBZ Solids) (NP (CD 4))) (. .)))
Crystalline Solids 4.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS solids)))) (VP (VBP are) (VP (VBG crystalline) (PP (IN in) (NP (NN nature))))) (. .)))