(S (S (NP (BASENP (NNP Mount) (NNP Redoubt)) (PRN (COMMA ,) (NP (BASENP (DT a) (NN volcano)) (PP (IN in) (BASENP (NNP Alaska)))) (COMMA ,))) (VP (VP (VBD erupted) (PP (IN on) (BASENP (NNP Saturday)))) (COMMA ,) (S (VP (VP (VP (VBG sending) (PRT (RP out))) (NP (BASENP (NNS clouds)) (PP (IN of) (BASENP (NN ash))))) (ADVP (NP (BASENP (NNS thousands)) (PP (IN of) (BASENP (NNS feet)))) (RB high)))))) (PERIOD .))