(S (S (S (BASENP (QP (RB about) (NN one) (NN hundred)) (NNS climbers)) (VP (VBP have) (VP (VP (VBN perished) (PP (IN since) (BASENP (NNP June) (NN 1)))) (PP (IN in) (NP (NP (NP (BASENP (NNP France)) (COMMA ,) (BASENP (NNP Italy))) (CC and) (BASENP (NNP Switzerland))) (ADVP (RB altogether))))))) (COMMA ,) (SBAR (WHPP (IN of) (WHNP (WP whom))) (S (BASENP (QP (RB about) (NN twenty))) (VP (VBP have) (VP (VBN died) (PP (IN on) (BASENP (NNP Mont) (NNP Blanc)))))))) (PERIOD .))