definiens: shall mean, with respect to each Licensed Product and each country in the Licensee Territory, the period beginning on the dat e of the First Commercial Sale of such Licensed Pro duct in such country, and ending on the later to occur of ( i ) the earlier of ( A ) the later of ( 1 ) the expirati on of the last - to - expire Licensor Patent that includes a Valid Claim that covers such Licensed Product in such country a nd ( 2 ) the expiration of Regulatory Exclusivity in such countr y for such Licensed Product and ( B ) the last day of the first Calendar Quarter in which unit sales of all Generic Products in such country exceed fifty percent ( 50 % ) of the sum of units sales of such Licensed Product and all Generic Products in such country during such Calen dar Quarter ; and ( ii ) the tenth ( 10th ) anniversary of t he First Commercial Sale of such Licensed Product i n such country