United States v. Torres-Diaz, ___ F.3d ___, 2006 WL 225615 (5th Cir. Jan. 30, 2006) (for purposes of determining which one of the various alternative subdivisions of the statute of a prior conviction was the subdivision of which the defendant was convicted, the charging document filed in the prior case unambiguously identifying the one particular subdivision charged suffices to carry that burden, absent anything in the record affirmatively casting doubt on, or creating an ambiguity respecting, that conclusion, at least where no claim is made before the district court that the prior conviction was in actuality under a different subdivision than that reflected in the charging instrument or in actuality the conviction was based on some other, materially different charging document).