Pay and discharge promptly when due all material Taxes imposed upon it or upon its income or profits or in respect of its Property before the same shall become delinquent or in default, as well as all lawful claims for labor, materials and supplies or otherwise, which, if unpaid, might give rise to Liens upon such Property or any part thereof (except as otherwise permitted by Section 6.02 hereof), unless being diligently contested in good faith by appropriate proceedings and as to which adequate reserves in an amount not less than the aggregate amount secured by such Liens have been established in accordance with GAAP; provided , however , that such contested amounts giving rise to such Liens shall be immediately paid upon commencement of any procedure or proceeding to foreclose any of such Liens unless the same shall be validly stayed by a court of competent jurisdiction or a surety bond, which is satisfactory in all respects to the Administrative Agent, is delivered to the Administrative Agent for the ratable benefit of the Lenders in an amount no less than such contested amounts.