(S (S (NP (NP (BASENP (NNS Cave-ins)) (PP (IN at) (BASENP (NN three) (NN plaster) (NNS mines)))) (PP (IN on) (BASENP (NNP November) (NN 6)))) (VP (VP (VBD caused) (BASENP (NN 33) (NNS deaths))) (CC and) (VP (VBD left) (NP (QP (ADVP (IN at) (JJS least)) (NN four)) (NN missing))))) (PERIOD .))