( ( The subscript ) ( ( shows ( ( the number ) ( of ( ( each type ) ( of atom ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN subscript)) (VP (VBZ shows) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (DT each) (NN type)) (PP (IN of) (NP (NN atom))))))) (. .)))
The subscript shows the number of each type of atom.
(ROOT (S (SBAR (IN If) (S (NP (NP (RB only) (CD one) (NN atom)) (PP (IN of) (NP (DT a) (JJ specific) (NN type)))) (VP (VBZ is) (ADJP (JJ present))))) (NP (DT a) (NN subscript)) (VP (VBZ is) (RB not) (VP (VBN used))) (. .)))