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The Commodity Futures Trading Commission (CFTC) on Friday, August 13, 2010, sent a letter to CME Group, Inc. regarding a Chicago Board of Trade (CBOT) self-certified Market Regulation Advisory Notice issued on October 19, 2009. In that notice, CBOT stated that its rules do not permit the execution of exchange of futures for futures (EFF) transactions. The notice was issued shortly after the CFTC approved an ELX Futures (ELX) rule authorizing participants on ELX to carry out EFF transactions. The Commission's August 13 letter supports a previous CFTC staff letter regarding this matter.