(S (S (BASENP (DT The) (NN problem)) (VP (VBD started) (PP (IN with) (NP (BASENP (DT a) (NN group)) (PP (IN of) (NP (QT (DQL ``) (BASENP (JJ boot-only) (NNS hikers)) (DQR '')) (SBAR (WHNP (WP who)) (S (VP (VP (VBD were) (VP (VP (VP (VBN stopped) (PP (IN by) (BASENP (DT the) (NN police)))) (PP (IN in) (BASENP (DT the) (NNP Alpine) (NN region)))) (BASENP (JJ last) (NN autumn))))))))))))) (PERIOD .))