(QTR (QTC (S (NP (EX There)) (VP (VP (VBP are) (NP (BASENP (NN plenty)) (PP (IN of) (NP (BASENP (JJ existing) (NNS mechanisms)) (SBAR (S (VP (TO to) (VP (VB do) (BASENP (DT this)))))))))) (PP (IN for) (NP (BASENP (NN drug) (NN trafficking)) (COMMA ,) (PP (IN for) (BASENP (NN example))))))) (PERIOD .)) (DQR ''))