(S (S (PP (IN On) (BASENP (NNP Sunday))) (S (BASENP (NN two) (JJ separate) (NN suicide) (NN bombing) (NNS attacks)) (VP (VBD killed) (NP (QP (ADVP (RB up) (TO to)) (NN 31)) (NNS people))))) (PERIOD .))