( ( ( ( electrons or ) holes ) ( of ( the ( conjugated bonds ) ) ) ) ( ( jump ( from ( one ( double bond ) ) ) ) ( to ( ( ( another -LRB- ) ( & pi ) ) ; ) ) ) )
(ROOT (S (NP (NP (NNS electrons) (CC or) (NNS holes)) (PP (IN of) (NP (DT the) (JJ conjugated) (NNS bonds)))) (VP (VBP jump) (PP (IN from) (NP (CD one) (JJ double) (NN bond))) (PP (TO to) (NP (NP (DT another)) (-LRB- -LRB-) (NP (CC &) (NN pi)) (: ;))))))
electrons or holes of the conjugated bonds jump from one double bond to another (&pi;
(ROOT (S (NP (DT A) (JJ double) (NN bond)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD one) (NN sigma) (NN bond)) (CC and) (NP (CD one) (NN pi) (NN bond))))) (. .)))