Any underpayment of tax outstanding on the date of the enactment of this subsection which is attributable to the application of section
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(b)(3) for any taxable year ending before January 1, 2008, and any interest or penalty with respect to such underpayment which is outstanding on such date of enactment, is hereby abated. The amount determined under subsection (b)(1) shall not include any tax abated under the preceding sentence.