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Ava: Could you tell me the number for ? buy nizagara A spokesman for exchange operator CBOE Holdings said theCBOE's Department of Market Regulation reviews unusual activityon a regular basis but does not comment on specificinvestigations. The U.S. Securities and Exchange Commission,which looks into unusual stock and option trading, did notimmediately respond to an email from Reuters. A Leap spokesmandeclined to comment on the options activity.