contribute to a mood that 's sustained through the surprisingly somber conclusion . 
(ROOT (S (VP (VB contribute) (PP (IN to) (NP (NP (DT a) (NN mood)) (SBAR (WHNP (WDT that)) (S (VP (VBZ 's) (VP (VBN sustained) (PP (IN through) (NP (DT the) (ADJP (RB surprisingly) (JJ somber)) (NN conclusion)))))))))) (. .)))
(ROOT (S (VP (VB ) (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (VP (VBN ) (PP (IN ) (NP (DT ) (ADJP (RB ) (JJ )) (NN )))))))))) (. )))