Exhibit A
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 Warren E. Buffett as its agent andattorney-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: August 11, 2017 | /s/ Warren E. Buffett | |||
| Warren E. Buffett | ||||
| Berkshire Hathaway Inc. | ||||
| Dated: August 11, 2017 | /s/ Warren E. Buffett | |||
| By: Warren E. Buffett Title: Chairman of the Board | ||||
| National Indemnity Company | ||||
| Dated: August 11, 2017 | /s/ Marc D. Hamburg | |||
| By: Marc D. Hamburg Title: Chairman of the Board | ||||
| GEICO Corporation | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| Government Employees Insurance Company | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| GEICO Indemnity Company | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| GEICO Advantage Insurance Company | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| GEICO Choice Insurance Company | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| GEICO Secure Insurance Company | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| GEICO Corporation Pension Plan Trust | ||||
| Dated: August 11, 2017 | /s/ Stephen C. Parsons | |||
| By: Stephen C. Parsons Title: Vice President | ||||
| The Buffalo News Office Pension Plan | ||||
| Dated: August 11, 2017 | /s/ Warren Colville | |||
| By: Warren Colville Title: President and Chief Executive Officer, The Buffalo News | ||||
| The Buffalo News Editorial Pension Plan | ||||
| Dated: August 11, 2017 | /s/ Warren Colville | |||
| By: Warren Colville Title: President and Chief Executive Officer, The Buffalo News | ||||
| The Buffalo News Mechanical Pension Plan | ||||
| Dated: August 11, 2017 | /s/ Warren Colville | |||
| By: Warren Colville Title: President and Chief Executive Officer, The Buffalo News | ||||
| The Buffalo News Drivers/Distributors Pension Plan | ||||
| Dated: August 11, 2017 | /s/ Warren Colville | |||
| By: Warren Colville Title: President and Chief Executive Officer, The Buffalo News | ||||
| Berkshire Hathaway Consolidated Pension Plan Master Retirement Trust | ||||
| Dated: August 11, 2017 | /s/ Marc D. Hamburg | |||
| By: Marc D. Hamburg Title: Senior Vice President, Berkshire Hathaway Inc. | ||||
| BNSF Master Retirement Trust | ||||
| Dated: August 11, 2017 | /s/ Julie Piggott | |||
| By: Julie Piggott Vice President, Burlington Northern Santa Fe, LLC | ||||
| Johns Manville Corporation Master Pension Trust | ||||
| Dated: August 11, 2017 | /s/ Mary Rhinehart | |||
| By: Mary Rhinehart Title: President and Chief Executive Officer, Johns Manville Corporation | ||||
| Acme Brick Company Pension Trust | ||||
| Dated: August 11, 2017 | /s/ Dennis Knautz | |||
| By: Dennis Knautz Title: President and Chief Executive Officer, Acme Building Brands | ||||
| Scott Fetzer Company Collective Investment Trust | ||||
| Dated: August 11, 2017 | /s/ Robert McBride | |||
| By: Robert McBride Title: President and Chief Executive Officer, Scott Fetzer Companies | ||||
| Lubrizol Master Trust Pension | ||||
| Dated: August 11, 2017 | /s/ Brian Valentine | |||
| By: Brian Valentine Title: Vice President, The Lubrizol Corporation | ||||
| General Re Corporation Employee Trust | ||||
| Dated: August 11, 2017 | /s/ Michael O’Dea | |||
| By: Michael O’Dea Title: Vice President, General Re Corporation | ||||
| Dated: August 11, 2017 | /s/ R. Ted Weschler | |||
| R. Ted Weschler | ||||
