Corrected entry: They television graphics for what is supposed to be Super Bowl 40 are shown as XXXX. The Roman numerals for 40 are XL; XXXX does not even exist in Roman numerals.
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Correction: Rubbish. XXXX and XL are (and were) used interchangeably for 'forty'. See the "Library's Roman Math" section of this page: http://query.nytimes.com/gst/fullpage.html?res=9E01E1DF123AF933A05750C0A961958260.