Workers build a structure outside the Mercedes-Benz Superdome on Monday, Jan. 28, 2013, in New Orleans. The San Francisco 49ers are scheduled to face the Baltimore Ravens in the NFL Super Bowl XLVII football game on Feb. 3. (AP Photo/Mark Humphrey)

Associated Press
Workers build a structure outside the Mercedes-Benz Superdome on Monday, Jan. 28, 2013, in New Orleans. The San Francisco 49ers are scheduled to face the Baltimore Ravens in the NFL Super Bowl XLVII football game on Feb. 3. (AP Photo/Mark Humphrey)
Workers build a structure outside the Mercedes-Benz Superdome on Monday, Jan. 28, 2013, in New Orleans. The San Francisco 49ers are scheduled to face the Baltimore Ravens in the NFL Super Bowl XLVII football game on Feb. 3. (AP Photo/Mark Humphrey)
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