(a)           During the Pre-Open period designated by the Exchange, traders may enter only Market on Open orders, Limit orders, GTC Limit orders, Stop Market orders and Stop Limit orders. Order modifiers are not permitted on orders entered during the Pre-Open.

(b)           Immediately upon the Market Open, e-cbot will apply an uncrossing algorithm to calculate the price at which the maximum volume will be traded. All orders executed pursuant to the uncrossing algorithm will be executed at a price equal to or better than that at which they were entered. Market on Open orders are processed immediately after the uncrossing. The Exchange does not guarantee the execution of any order at the opening price. (11/29/07)