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
INSURANCE COMPANIES AS DEFINED IN SECTION 3(a)(19) OF THE ACT:
National Indemnity Company
Government Employees Insurance Company
National Fire & Marine Insurance Company
EMPLOYEE BENEFIT PLANS IN ACCORDANCE WITH § 240.13d-1(b)(1)(ii)(F)
Berkshire Hathaway Consolidated Pension Plan Master Trust
Precision Castparts Corp. Master Trust
BNSF Master Retirement Trust
OTHER MEMBER OF FILING GROUP
R. Ted Weschler