SCHEDULE 13G
EXHIBIT A
RELEVANT SUBSIDIARIES AND MEMBERS OF FILING GROUP
PARENT HOLDING COMPANIES OR CONTROL PERSONS:
Warren E. Buffett (an individual who may be deemed to control Berkshire Hathaway Inc.)
Berkshire Hathaway Inc.
GEICO Corporation
U.S. Investment Corporation
INSURANCE COMPANIES AS DEFINED IN SECTION 3(a)(19) OF THE ACT:
National Indemnity Company
National Fire & Marine Insurance Company
Columbia Insurance Company
Government Employees Insurance Company
Mount Vernon Fire Insurance Company
United States Liability Insurance Company
GEICO Indemnity Company
GEICO Casualty Company
BHG Life Insurance Company
Berkshire Hathaway Specialty Insurance Company
Berkshire Hathaway Life Insurance Company of Nebraska