definiens: ) . shall mean the Unit packaging sizes CO.5 ml / O.g ml ) within each category of Amvisc Products purchased by Buyer under the Agreement . If Buyer submits a Change Order less than lerty th'e ( 45 ) days prior to the Purchase Order Delivery Date, prior to Seller processing and fulfilling such order, the Parties shall first agree upon the additional amount, if any, to be paid by Buyer to Seller 12 UBCl2293912.3 to offset any increased incremental costs ( including materials, labor and variable overhead ) incurred by Seller in order to process and fulfill thc Change Order . . Confidential 3.3 Inventory Maintenance . Seller shall use commercially reasonable efforts to maintain, based on the number of Units estimated in the updated Quarterly Forecasts, work in progress ( ) inventory of bulk HA in an amount sufficient to supply Buyer 's reEjuirements fer aFI ) ' giveR three ( 3 ) month period