) obligations of a Person the payment of which is unconditionally guaranteed as its full faith and credit obligation by such government which, in the case of either subclause (i) or (ii) of this clause (x), is not callable or redeemable at the option of the issuer thereof and (y) any depositary receipt issued by a bank (as defined in Section 3(a)(2) of the Securities Act, or, in the case of the BFI Senior Indenture and the Other Indentures, as defined in the Bank Act (Canada)), as custodian with respect to any Government Obligation which is specified in clause (x) above and held by such bank for the account of the holder of such depositary receipt, or with respect to any specific payment of principal of or interest on any Government Obligation which is so specified and held, provided that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depositary receipt from any amount received by the custodian in respect of the Government Obligation or the specific payment of principal or interest evidenced by such depositary receipt.