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.
	OBH, Inc.
	National Indemnity Company
	GEICO Corporation
	Berkshire Hathaway Life Insurance of Nebraska
INSURANCE COMPANIES AS DEFINED IN SECTION 3(a)(19) OF THE ACT:
	Government Employees Insurance Company
	Cornhusker Casualty Company
EMPLOYEE BENEFIT PLANS IN ACCORDANCE WITH 13d-1(b)(1)(ii)(F):
	Benjamin Moore Pension
	The Buffalo News Office Pension Plan
	The Buffalo News Editorial Pension Plan
	FlightSafety International Inc. Retirement Income Plan
	Fruit of the Loom Pension Trust
	GEICO Corporation Pension Plan Trust
	Johns Manville Corporation Master Pension Trust
	Justin Brands, Inc. Union Pension Plan & Justin Brands, Inc. Pension Plan & Trust
	Acme Brick Company Pension Trust
	Scott Fetzer Company Collective Investment Trust