( ( c -RRB- ) ( ( ( Stratosphere , ) ( Troposphere ( , ( Mesosphere ( , Stratosphere ) ) ) ) ) . ) )
(ROOT (NP (LST (LS c) (-RRB- -RRB-)) (NP (NNP Stratosphere)) (, ,) (NP (NNP Troposphere) (, ,) (NNP Mesosphere) (, ,) (NNP Stratosphere)) (. .)))
c)Stratosphere, Troposphere, Mesosphere, Stratosphere.
(ROOT (S (NP (DT The) (NN stratosphere)) (VP (VBZ is) (NP (NP (DT the) (NN layer)) (PP (IN above) (NP (DT the) (NNP troposphere))))) (. .)))