valiantly keep punching up the mix . 
(ROOT (S (ADVP (RB valiantly)) (VP (VB keep) (S (VP (VBG punching) (PRT (RP up)) (NP (DT the) (NN mix))))) (. .)))
(ROOT (S (ADVP (RB )) (VP (VB ) (S (VP (VBG ) (PRT (RP )) (NP (DT ) (NN ))))) (. )))