( ( ( K2 Mountain ) ( of Mountains ) ) . )
(ROOT (NP (NP (NNP K2) (NNP Mountain)) (PP (IN of) (NP (NNPS Mountains))) (. .)))
K2 Mountain of Mountains.
(ROOT (S (NP (NNP K2)) (VP (VBZ is) (NP (NP (DT the) (JJ second) (JJS highest) (NN mountain)) (PP (IN in) (NP (DT the) (NN world)))) (, ,) (PP (IN at) (NP (IN over) (CD 28,000) (NNS feet)))) (. .)))