For instance , he discovered that for Madoff 's strategy to work , he would have had to buy more options on the Chicago Board Options Exchange than actually existed .
ADP NOUN , PRON VERB SCONJ ADP PROPN PART NOUN PART VERB , PRON AUX AUX VERB PART VERB ADJ NOUN ADP DET PROPN PROPN PROPN PROPN SCONJ ADV VERB .