( Mercury ( ( is ( ( the ( smallest planet ) ) ( in ( the ( Solar System ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP System))))) (. .)))
Mercury is the smallest planet in the Solar System.
(ROOT (S (NP (NNP Mercury)) (VP (VBZ is) (NP (NP (DT the) (JJS smallest) (NN planet)) (PP (IN in) (NP (PRP$ our) (JJ solar) (NN system))))) (. .)))