Applicable Principles. For purposes of calculating the Realized Tax Benefit or Realized Tax Detriment for any period, carryovers or carrybacks of any Tax item attributable to the Blocker Pre-BCA Covered Tax Assets and the Exchange Covered Tax Assets shall be considered to be subject to the rules of the Code and the Treasury Regulations, as applicable, or other applicable law, governing the use, limitation and expiration of carryovers or carrybacks of the relevant type. If a carryover or carryback of any Tax item includes a portion that is attributable to a Blocker Pre-BCA Covered Tax Asset or an Exchange Covered Tax Asset and another portion that is not, such respective portions shall be considered to be used in accordance with the “with and without” methodology.