Debtor will, and will cause each Subsidiary to, file all tax returns required by law before the due date thereof (as validly extended) and pay and discharge promptly when due all taxes, assessments and governmental charges or levies imposed upon it or upon its income or upon any of its property as well as all claims of any kind (including claims for labor, materials, supplies and rent) which, if unpaid, might become a Lien upon any of the Collateral; provided, however, Debtor or the applicable Subsidiary shall not be required to pay any such tax, assessment, charge, levy or claim if the amount, applicability or validity thereof shall currently be contested in good faith by appropriate proceedings diligently conducted and if the contesting party shall have set up reserves therefor adequate under GAAP.