No provision of this Guaranty may be waived, amended, supplemented or modified, except by a written instrument executed by Administrative Agent and each Guarantor.  No failure by Administrative Agent to exercise, and no delay in exercising, any right, remedy or power hereunder shall operate as a waiver thereof; nor shall any single or partial exercise of any right, remedy or power hereunder preclude any other or further exercise thereof or the exercise of any other right, power or remedy.  The remedies herein provided are cumulative and not exclusive of any remedies provided by law or in equity.  The unenforceability or invalidity of any provision of this Guaranty shall not affect the enforceability or validity of any other provision herein.  Unless otherwise agreed by Administrative Agent and each Guarantor in writing, this Guaranty is not intended to supersede or otherwise affect any other guaranty now or hereafter given by any Guarantor for the benefit of Administrative Agent or any term or provision thereof.