Each Indenture provides that, at the option of the Issuer, unless and until the Issuer has exercised its Defeasance option described in the preceding paragraph, the Issuer may omit to comply with certain restrictive covenants and such omission shall not be deemed to be an Event of Default under the Indenture and the Outstanding Securities upon irrevocable deposit with the applicable Trustee(s), in trust, of money and/or Government Obligations which will provide money in an amount sufficient, in the opinion of a nationally recognized firm of independent public accountants, to pay the principal of and premium, if any, and each instalment of interest, if any, on the Outstanding Securities of the Issuer ("Covenant Defeasance"). In the event the Issuer exercises its Covenant Defeasance option, the obligations under the applicable Indenture (other than with respect to such covenants and the Events of Default other than the Events of Default relating to such covenants above) shall remain in full force and effect. Such trust may only be established if certain customary conditions precedent are satisfied, including, among other things, confirmation that Holders will not recognize gain or loss for U.S. federal income tax purposes as a result of such Covenant Defeasance. (Article Thirteen of the BN Indenture, Article Fourteen of the BFI Senior Indenture and the Other Indentures.)