Invalidity of the Loan Documents. Any material provision of any Loan Document, at any time after its execution and delivery and for any reason other than as expressly permitted hereunder or thereunder or the occurrence of the Termination Date, ceases to be in full force and effect; or the Borrower contests in writing or pursuant to judicial proceedings the validity or enforceability of any material provision of any Loan Document; or the Borrower denies in writing that it has any or further liability or obligation under any Loan Document (other than by reason of the occurrence of the Termination Date), or purports to revoke, terminate or rescind any material provision of any Loan Document; or
