( ( ( Permanent supply ) ( of ( clean ( , ( fresh ( drinking water ) ) ) ) ) ) . )
(ROOT (NP (NP (JJ Permanent) (NN supply)) (PP (IN of) (NP (JJ clean) (, ,) (JJ fresh) (NN drinking) (NN water))) (. .)))
Permanent supply of clean, fresh drinking water.
(ROOT (S (NP (NP (QP (IN At) (JJS least) (CD 20)) (NN percent)) (PP (IN of) (NP (NP (DT the) (NN world) (POS 's)) (NNS people)))) (VP (VBP do) (RB not) (VP (VB have) (NP (NP (DT a) (JJ ready) (NN supply)) (PP (IN of) (NP (JJ clean) (NN drinking) (NN water)))))) (. .)))