( ( POM anions ) ( ( can ( be ( reduced ( ( ( by ( ( one electron ) each ) ) or ) ( by ( ( ( more ( than one ) ) electron ) ( -LRB- ( ( ( Weinstock , ) 161 ) -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP POM) (NNS anions)) (VP (MD can) (VP (VB be) (VP (VBN reduced) (PP (PP (IN by) (NP (NP (CD one) (NN electron)) (NP (DT each)))) (CC or) (PP (IN by) (NP (NP (QP (JJR more) (IN than) (CD one)) (NN electron)) (PRN (-LRB- -LRB-) (NP (NNP Weinstock)) (, ,) (NP (CD 161)) (-RRB- -RRB-)))))))) (. .)))
POM anions can be reduced by one electron each or by more than one electron (Weinstock, 161).
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN anion)) (VP (VBZ is) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (DT an) (NN element)) (VP (VBZ gains) (NP (QP (CD one) (CC or) (JJR more)) (NNS electrons))))))) (. .)))