( Subscripts ( ( are ( used ( to ( denote ( ( the numbers ) ( of ( ( each type ) ( of atom ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Subscripts)) (VP (VBP are) (VP (VBN used) (S (VP (TO to) (VP (VB denote) (NP (NP (DT the) (NNS numbers)) (PP (IN of) (NP (NP (DT each) (NN type)) (PP (IN of) (NP (NN atom))))))))))) (. .)))
Subscripts are used to denote the numbers 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))) (. .)))