We may redeem the 2023 Notes at any time prior to May 6, 2023, the 2027 Notes at any time prior to September 6, 2027, the 2037 Notes at any time prior to June 6, 2037, the 2047 Notes at any time prior to June 6, 2047, and the 2057 Notes at any time prior to June 6, 2057, in each case, in whole or in part, upon giving not less than 30 days nor more than 60 days' notice to holders of the applicable Notes (which notice shall be irrevocable), at a redemption amount equal to the greater of:

- 100% of the principal amount of the applicable Notes to be redeemed; and

- the "make-whole amount," which means the amount determined by the Paying Agent on the fifth Business Day before the redemption date equal to the sum of

(i) the present value of the principal amount of the applicable Notes to be redeemed, assuming a scheduled repayment thereof on the stated maturity date, plus

(ii) the present value of the remaining scheduled payments of interest on such Notes to and including the stated maturity date (exclusive of interest accrued to the redemption date), in each case discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months and, in

the case of an incomplete month, the actual number of days elapsed) at the Treasury Yield plus 12.5 basis points in the case of the 2023 Notes, plus 20 basis points in the case of the 2027 Notes, plus 20 basis points in the case of the 2037 Notes, plus 25 basis points in the case of the 2047 Notes, and plus 25 basis points in the case of the 2057 Notes; plus, in each case, accrued and unpaid interest, if any, on such Notes to, but not including, the redemption date; provided that the principal amount of any series of the applicable Notes that remain outstanding after redemption in part shall be US$200,000 or an integral multiple of US$1,000 in excess thereof.