CUSIP # 57142B104 Page 12 of 12

EXHIBIT A

Agreement of Joint Filing

The undersigned hereby agree that a single Schedule 13G (or any amendment thereto) relating to the Common Stock of the Issuer shall be filed on behalf of each of the undersigned and that this Agreement shall be filed as an exhibit to such Schedule 13G.

Date: February 11, 2022

GRANITE MANAGEMENT II, LLC
By Granite Ventures, LLC
Its Managing Member
By	/s/ Jacqueline Berterretche
Printed Name: Jacqueline Berterretche
Title: Member
GRANITE VENTURES II, L.P.
By Granite Management II, LLC
Its General Partner
By	/s/ Jacqueline Berterretche
Printed Name: Jacqueline Berterretche
Title: Member
GRANITE VENTURES ENTREPRENEURS FUND II, L.P.
By Granite Management II, LLC
Its General Partner
By	/s/ Jacqueline Berterretche
Printed Name: Jacqueline Berterretche
Title: Member
By	/s/ Jacqueline Berterretche
	Jacqueline Berterretche
By	/s/ Christopher McKay
	Christopher McKay
By	/s/ Standish O’Grady
	Standish O’Grady