definiens: which is agreed andunderstood to mean the later of ( A ) the execution date of the relevant Implementing Agreement, ( B ) if a determinationis made pursuant to this Section 3.2 that an HSR / Antitrust Filing is not required to be made under any Antitrust Lawfor the relevant Implementing Agreement, the date of such determination, or ( C ) if a determination is made pursuant tothis Section 3.2 that an HSR / Antitrust Filing is required to be made under any Antitrust Law for the relevantImplementing Agreement, the Antitrust Clearance Date . As used herein : ( x ) means theearliest date on which the Parties have actual knowledge that all applicable waiting periods under the HSR Act andany comparable waiting periods as required [ * * * ] Certain information in this document has been omitted and filed separately with the Securities and ExchangeCommission . Confidential treatment has been requested with respect to the omitted portions