( ( ( physical science ) ( -LRB- ( ( chemistry ( , ( physics ( , mathematics ) ) ) ) -RRB- ) ) ) ; )
(ROOT (NP (NP (JJ physical) (NN science)) (PRN (-LRB- -LRB-) (NP (NN chemistry) (, ,) (NN physics) (, ,) (NN mathematics)) (-RRB- -RRB-)) (: ;)))
physical science (chemistry, physics, mathematics);
(ROOT (S (NP (NP (NNP Chemistry)) (CC and) (NP (NNS physics))) (VP (VBP are) (NP (NP (NNS fields)) (PP (IN in) (NP (JJ physical))))) (. .)))