(S (S (BASENP (PRP They)) (VP (VBD held) (NP (NP (NP (BASENP (NNS hammers)) (COMMA ,) (BASENP (JJ big) (NNS dumb-bells))) (COMMA ,) (BASENP (NN metal) (NNS crow-bars))) (CC and) (BASENP (NNS sticks))))) (PERIOD .))