( ( Murphy ( uses ( ( the planets ) ( of ( the ( solar system ) ) ) ) ) ) ( , ( Digby ( ( ( bases ( his classification ) ) ( on ( ( ( ( ( the ( five ( alchemical elements ) ) ) , ) ( Earth ( , ( Water ( , ( Fire , ) ) ) ) ) ) and ) Ether ) ) ) . ) ) ) )
(ROOT (S (S (NP (NNP Murphy)) (VP (VBZ uses) (NP (NP (DT the) (NNS planets)) (PP (IN of) (NP (DT the) (JJ solar) (NN system)))))) (, ,) (NP (NNP Digby)) (VP (VBZ bases) (NP (PRP$ his) (NN classification)) (PP (IN on) (NP (NP (DT the) (CD five) (JJ alchemical) (NNS elements)) (, ,) (NP (NNP Earth) (, ,) (NNP Water) (, ,) (NNP Fire) (, ,)) (CC and) (NP (NNP Ether))))) (. .)))
Murphy uses the planets of the solar system, Digby bases his classification on the five alchemical elements, Earth, Water, Fire, and Ether.
(ROOT (S (NP (NNP Earth)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN planet)) (PP (IN in) (NP (NP (DT the) (JJ solar) (NN system)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (NP (NN water)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ essential)) (PP (IN for) (NP (JJ human) (NN life))) (, ,) (ADJP (JJ present)) (PP (IN in) (NP (NP (QP (DT all) (CD three))) (PP (IN of) (NP (PRP$ its) (NNS states)))))))))))))))) (. .)))