(S (S (BASENP (DT The) (NN attack)) (VP (VP (VBZ is) (NP (NP (BASENP (NNP Moscow) (POS 's)) (NN second)) (PP (IN within) (BASENP (DT a) (NN year))))) (COMMA ,) (PP (IN with) (S (NP (BASENP (NN two) (NNS women)) (PP (IN from) (NP (BASENP (NNP Dagestan)) (COMMA ,) (BASENP (NNP North) (NNP Caucuses))))) (VP (VP (VP (VP (VBG blowing) (BASENP (PRP themselves))) (ADVP (RB up) (PP (IN on) (BASENP (DT the) (NNP Metro))))) (CC and) (VP (VBG killing) (BASENP (NN 39)))) (PP (IN in) (BASENP (NN 2010)))))))) (PERIOD .))