This excerpt taken from the MER 8-K filed Jul 8, 2008.
Discontinuation of a Basket Component or Reference Currency
In the event a Basket Component is replaced by a successor monetary unit (the New Currency) as the legal tender of such Basket Components country, the Calculation Agent shall calculate the Ending Value by using the exchange rate of the New Currency relative to the Reference Currency on the Valuation Date, multiplied by a fraction the numerator of which shall be 1 and the denominator of which shall be the number of units of the Basket Component represented by one unit of the New Currency. Conversely, in the event Reference Currency is replaced by a New Currency, the Calculation Agent shall calculate the Ending Value by using the exchange rates of the Basket Components relative to the New Currency on the Valuation Date, multiplied by the number of units of the Reference Currency represented by one unit of the New Currency. No other changes shall be made to the terms of the Note as a result of such replacement.