Borrower will (a) pay and discharge all of their Obligations as and when due and payable before the same shall become in default and (b) pay and discharge promptly all taxes, assessments and governmental charges or levies imposed upon them or upon their income and profits, or upon any of their property, real, personal or mixed, or upon any part thereof, before the same shall become in default, as well as all lawful claims for labor, materials and supplies or otherwise which, if unpaid, might become a lien or charge upon such properties or any part thereof; provided, however, that Borrower will not be required to pay and discharge any such Obligation, tax, assessment, charge, levy or claim so long as the validity thereof shall be diligently and continuously contested in good faith by appropriate proceedings with respect to any such Obligation, tax, assessment, charge, levy or claim so contested.