SCHEDULE 13G

EXHIBIT B

JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

The undersigned persons hereby agree that reports on Schedule 13G, and amendments thereto, with respect to the Common Stock of Celanese Corporation. may be filed in a single statement on behalf of each of such persons, and further, each of such persons designates Warren E. Buffett as its agent and Attorney-in-Fact for the purpose of executing any and all Schedule 13G filings required to be made by it with the Securities and Exchange Commission.

Dated: February 14, 2024	/s/ Warren E. Buffett
	Warren E. Buffett
	Berkshire Hathaway Inc.
Dated: February 14, 2024	/s/ Warren E. Buffett
	By: Warren E. Buffett Title: Chairman of the Board