(a) Do, or cause to be done, all things necessary to preserve, renew and keep in full force and effect its legal existence, except, in the case of a Subsidiary of the Borrower that is not a Loan Party, where the failure to do so would not reasonably be expected to have a Material Adverse Effect, and except as otherwise expressly permitted under Section 6.05 ; provided that the Borrower each First Tier Covenant Party, as applicable, may liquidate or dissolve one or more of its Subsidiaries if the assets of such Subsidiaries to the extent they exceed estimated liabilities are acquired by the Borrower such First Tier Covenant Party or a Wholly-Owned Subsidiary of the Borrower such First Tier Covenant Party in such liquidation or dissolution; except that Subsidiary Loan Parties may not be liquidated into Subsidiaries of Holdings that are not Loan Parties and Domestic Subsidiaries may not be liquidated into Foreign Subsidiaries.