CONFIDENTIAL William H. Gates Dear Bill: RE: Letter of Agreement Regarding Purchase of Partnership Interest Effective September 3, 2013, this letter sets forth the "Agreement" by and between you, William H. Gates ("Gates"), and me, Dr. Boris Nikolic ("Dr. Nikolic"), with respect to the purchase by Gates from Dr. Nikolic of Dr. Nikolic's interest in a partnership, under the terms of which we discussed potential investment in a range up to $100 Million in certain investments discovered and researched by Dr. Nikolic (the "Investment Entity"). Only two of such investments, totaling Twenty Million Dollars, as detailed below, were ever made. The partnership was formed effective April 1, 2013. We now agree to dissolve and wind up the Investment Entity and Gates shall purchase from Dr. Nikolic Dr. Nikolic's interest in the Investment Entity. Gates and Dr. Nikolic have agreed as follows: Dissolution and Dr. Nikolic acknowledges and agrees to the dissolution and winding up of Winding Up the the Investment Entity, that he has disassociated himself from the Partnership Investment Entity, and that Gates shall have the exclusive authority to wind up the Investment Entity. Sale and Purchase of Interest in Investment Entity Advance SE-251912 vi As part of the dissolution and winding up of the Investment Entity, Dr. Nikolic shall, and does hereby agree to, sell, transfer and convey to Gates, and Gates shall purchase from Dr. Nikolic, all of Dr. Nikolic's right, title and interest in and to the Investment Entity and the underlying partnership assets for a purchase price equal to the aggregate of all amounts payable under all Investment Entity Payment Demands (as hereinafter defined) to be made by Dr. Nikolic to Gates during the Payment Period (as hereinafter defined) pursuant to this Agreement. Such sale and purchase shall be deemed to have been completed, effective upon Gates' payment in full to Dr. Nikolic of all amounts payable under all Investme