December 28, 2006

Ms. Eileen A. Donovan

Acting Secretary

Commodity Futures Trading Commission
Three Lafayette Center

1155 21° Street, NW.

Washington, DC 20581

Reference File #2751.02
Rule Certification

Dear Ms. Donovan:

Pursuant to Commission Regulation 40.6(a), the Chicago Board of Trade (CBOT®) hereby
submits the following, which corrects and supersedes a previous submission dated December 19,
2006 (CBOT Reference File #2751.01):

- Extend, through January 31, 2008, the designation of 10-Year and 5-Year
Interest Rate Swap futures and futures options for trading pursuant to
existing Regulation 331.05 (copy attached), at the established minimum size
threshold of 2,000 contracts on an outright basis.

This extension will continue a pilot program previously scheduled to expire as of December 31,
2006,

There were no opposing views concerning this program extension,

The CBOT certifies that this program extension complies with the Commodity Exchange Act
and the rules thereunder.

Sincerely,

Paul J. Draths
Vice President and Secretary

b121206


331.05 Block Trade Transactions — The Exchange may designate any contract initially listed for
trading on or after December 31, 1999 as eligible for Block Trade transactions under this Regulation and
shatl determine the minimum size thresholds for the contracts in which Block Trade transactions are
permitted. In determining the minimum size threshold, the Exchange shall take into consideration (to the
extent available) the size distribution of transactions in the contract, the size distribution of transactions in
the related cash or over-the-counter markets, and all other information relevant to transaction size in the
relevant contract. The hours of operation of the Block Trade facility shall be determined by the Exchange.

Members may enter into transactions outside of the Exchange's central markets, at prices mutually
agreed, with respect to contracts that have been designated by the Exchange for such purpose, provided
that the following conditions are satisfied:

a) Each buy or sell order underlying a Block Trade must (i) state explicitly that it is to be, or may
be, executed by means of a Block Trade and (ii) be at least for the minimum transaction size
as determined by the Exchange. Orders may not be aggregated in order to achieve the
minimum transaction size; provided, that a commodity trading advisor registered (or exempt
from registration) under the Commodity Exchange Act, including without limitation any
investment advisor registered (or exempt from registration) under the Investment Advisors
Act of 1940, or a foreign person performing a similar role or function subject as such to
foreign regulation, with total assets under management exceeding $25 million, may
aggregate customer orders in order to achieve the minimum transaction size.

b) The price at which a Block Trade is executed must be fair and reasonable in light of (i) the
size of such Block Trade; (ii) the price and size of other trades in the same contract at the
relevant time; and (iii) the price and size of trades in other relevant markets, including
without limitation the underlying cash market or other related futures markets, at the relevant
time. The price at which a Block Trade is executed shall not affect conditional orders such
as limit orders or stop orders. The price at which a Block Trade is executed shall not be
used in establishing settlement prices.

c) Each nonmember customer to a Block Trade transaction must qualify as an “eligible contract
participant’, as that term is defined in Section 1a(12) of the Commodity Exchange Act,
provided that, if any Block Trade is entered into on behalf of customers by a commodity
trading advisor registered (or exempt from registration) under the Act, including without
limitation any investment advisor registered (or exempt from registration) under the
Investment Advisors Act of 1940, or a foreign person performing a similar role or function
subject as such to foreign regulation, with total assets under management exceeding $25
million, the individual customers need not so qualify.

d) Each Block Trade executed pursuant to this Regulation must be cleared through the clearing
members. Information identifying the relevant contract, contract month, price, quantity, time
of execution, counterparty clearing member, and for options, strike price, put or call and
expiration month, for each Block Trade must be reported by the seller to the Exchange within
five minutes immediately following execution of such Block Trade. The Exchange will
publicize information identifying the trade as a Block Trade and identifying the relevant
contract, contract month, price or premium, quantity and, if applicable, the underlying
commodity, whether the transaction involved a put or a call and the strike price, for each
Block Trade immediately after such information has been reported to the Exchange.

e) Each clearing member and member that is party to a Block Trade shall record the following
details on its order ticket: the contract (including the delivery or expiry month) to which such
Block Trade relates; that the trade is a Block Trade; the number of contracts traded; the
price of execution or premium; the time of execution; the identity of the counterparty; for
options, strike price, and put or call and, if applicable, details regarding the customer for
which the Block Trade was executed, the underlying commodity, whether the transaction
involved a put or a call and the strike price. Upon request by the Exchange, such clearing
member or member shall produce satisfactory evidence, including without limitation the
order ticket referred to in the preceding sentence, that the Block Trade meets the
requirements set forth in this Regulation.