X0202 4/A 2007-05-18 2007-05-22 0 0001060349 GAMCO INVESTORS, INC. ET AL GBL 0001052192 CASCADE INVESTMENT LLC 2365 CARILLON POINT KIRKLAND WA 98033 0 0 1 0 0000902012 GATES WILLIAM H III ONE MICROSOFT WAY REDMOND WA 98052 0 0 1 0 Convertible Promissory Note 53 2001-08-14 2011-08-14 Class A Common Stock 943396 50000000 D On May 22, 2007, the reporting persons mistakenly filed a Form 4 reporting a purchase of 1,000 shares of common stock that did not in fact occur. As of May 18, 2007, the reporting persons held only a Convertible Promissory Note previously issued by the Issuer to the reporting persons in the aggregate principal amount of $50,000,000. * Duly authorized under Special Power of Attorney appointing Michael Larson attorney-in-fact, dated February 3, 2006, by and on behalf of William H. Gates III, filed as Exhibit 99.1 to Cascade Investment, L.L.C.'s Amendment No. 2 to Schedule 13G with respect to Arch Capital Group Ltd. on March 7, 2006, SEC File No. 005-45257, and incorporated by reference herein. Cascade Investment, L.L.C. By: /s/ Michael Larson, Business Manager 2007-05-24 William H. Gates III By: /s/ Michael Larson*, Attorney-In-Fact 2007-05-24