On the date of expiration of the advance payment bond of the relevant Purchase Order, the Contractor, at its own cost and expense, shall, in exchange for the advance payment bond, provide the Customer with a ~~! b~~ issued by a commercial bank with a brancl1: in Thailand in an amount equal to 5%Jfive percent) of the relevant Purchase Order, in the form as set forth in Appendix H Part II (F{;"rm of Contract Bond) or any other form agreed by the Parties, which said contract bond shall take effect from the expiry date of the advance payment bond in accordance with this Clause and shall remain valid and in effect until the expiration of the last Warranty Period under the relevant Purchase Order.