EXHIBIT 2.3

CUSIP No.  489398107

AGREEMENT CONCERNING JOINT FILING 

OF SCHEDULE 13D

The undersigned agree as follows:

(i) each of them is individually eligible to use the Schedule 13D/A to which this Exhibit is attached, and such Schedule 13D/A is filed on behalf of each of them; and

(ii) each of them is responsible for the timely filing of such Schedule 13D/A and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other person making the filing, unless such person knows or has reason to believe that such information is inaccurate.

This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all of which, taken together, shall constitute one and the same instrument.

Dated: August 25, 2021

V. PREM WATSA
/s/ V. Prem Watsa
FFHL GROUP LTD.
By:	/s/ V. Prem Watsa
	Name:	V. Prem Watsa
	Title:	President
THE SECOND 810 HOLDCO LTD.
By:	/s/ V. Prem Watsa
	Name:	V. Prem Watsa
	Title:	President
THE SECOND 1109 HOLDCO LTD.
By:	/s/ V. Prem Watsa
	Name:	V. Prem Watsa
	Title:	President
THE SIXTY TWO INVESTMENT COMPANY LIMITED
By:	/s/ V. Prem Watsa
	Name:	V. Prem Watsa
	Title:	President
12002574 CANADA INC.
By:	/s/ V. Prem Watsa
	Name:	V. Prem Watsa
	Title:	President

ODYSSEY REINSURANCE COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
FAIRFAX FINANCIAL HOLDINGS LIMITED
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Vice President and Chief Operating Officer
FAIRFAX (US) INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ODYSSEY GROUP HOLDINGS, INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE COMPANY (U.S.) INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ZENITH NATIONAL INSURANCE CORP.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE COMPANY, LTD
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D

ALLIED WORLD SURPLUS LINES INSURANCE COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
1102952 B.C. UNLIMITED LIABILITY COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE COMPANY HOLDINGS, LTD
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE COMPANY HOLDINGS I, LTD
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD SPECIALTY INSURANCE COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D

AW UNDERWRITERS INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D

ALLIED WORLD INSURANCE COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE HOLDINGS (U.S.) INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ODYSSEY US HOLDINGS INC.
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ALLIED WORLD ASSURANCE HOLDINGS (IRELAND) LTD
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
ZENITH INSURANCE COMPANY
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D
RESOLUTION GROUP REINSURANCE (BARBADOS) LIMITED
By:	/s/ Peter Clarke
	Name:	Peter Clarke
	Title:	Attorney-in-Fact pursuant to Power of Attorney attached to this Schedule 13D

BRIT INSURANCE HOLDINGS LIMITED
By:	/s/ Mark Allan
	Name:	Mark Allan
	Title:	Director
BRIT SYNDICATES LIMITED
By:	/s/ Mark Allan
	Name:	Mark Allan
	Title:	Director
BRIT REINSURANCE (BERMUDA) LIMITED
By:	/s/ Mark Allan
	Name:	Mark Allan
	Title:	Director
BRIT UW LIMITED
By:	/s/ Mark Allan
	Name:	Mark Allan
	Title:	Director
BRIT LIMITED
By:	/s/ Mark Allan
	Name:	Mark Allan
	Title:	Chief Financial Officer and Director