FILE - In this Jan. 15, 1978 file photo, Denver Broncos quarterback Craig Morton (7) rests briefly on his knees after being sacked by Dallas Cowboys defensive end Ed Jones (72) following the play during NFL football's Super Bowl XII in New Orleans. The Cowboys defeated the Broncos 27-10. Peyton Manning will become only the third quarterback to start for two franchises in the Super Bowl. The first guy to do it, Morton, is among the thousands of former players suing the NFL about concussions. (AP Photo/File)
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