Exhibit E

AGREEMENT TO FILE SCHEDULE 13D JOINTLY

(as required by Item 7 of Schedule 13D)

               The undersigned persons hereby agree that reports on Schedule 13D, and any amendments thereto, may be filed in a single statement on behalf of all such persons, and further, each such person designates Marc D. Hamburg as its agent and attorney-in-fact for the purpose of executing any and all such reports required to be made by it with the Securities and Exchange Commission.

Dated:     March 14, 2003

BERKSHIRE HATHAWAY INC.			OBH, INC.
By:		/s/ MARC D. HAMBURG	By:	/s/ MARC D. HAMBURG
		Name: Marc D. Hamburg		Name: Marc D. Hamburg
		Title:   Vice President		Title:   Vice President
NATIONAL INDEMNITY COMPANY			NATIONAL FIRE AND MARINE INSURANCE COMPANY
By:		/s/ MARC D. HAMBURG	By:	/s/ MARC D. HAMBURG
		Name: Marc D. Hamburg		Name: Marc D. Hamburg
		Title:   Treasurer		Title:   Treasurer
CYPRESS INSURANCE COMPANY			COLUMBIA INSURANCE COMPANY
By:		/s/ RODNEY ELDRED	By:		/s/ MARC D. HAMBURG
		Name: Rodney Eldred			Name: Marc D. Hamburg
		Title:   Vice President			Title:   Treasurer
BH COLUMBIA INC.			NATIONAL LIABILITY & FIRE INSURANCE COMPANY
By:		/s/ MARC D. HAMBURG	By:			/s/ MARC D. HAMBURG
		Name: Marc D. Hamburg				Name: Marc D. Hamburg
		Title:   President				Title:   Treasurer
BLUE CHIP STAMPS			WESCO FINANCIAL CORPORATION
By:		/s/ JEFFREY L. JACOBSON	By:			/s/ JEFFREY L. JACOBSON
		Name: Jeffrey L. Jacobson				Name: Jeffrey L. Jacobson
		Title:   Vice President				Title:   Vice President
WESCO HOLDINGS MIDWEST, INC.			WESCO-FINANCIAL INSURANCE COMPANY
By:		/s/ MARC D. HAMBURG	By:			/s/ MARC D. HAMBURG
		Name: Marc D. Hamburg				Name: Marc D. Hamburg
		Title:   Treasurer				Title:   Assistant Secretary
WARREN E. BUFFETT
	/s/ WARREN E. BUFFETT