TALLAHASSEE, Fla. — Back in December, in North Carolina’s ACC opener, the Tar Heels trailed at half and overcame a double-digit deficit in the second half to defeat Florida State. You know what they say: history has a way of repeating itself. This time, it was an eight-point Seminoles lead that Carolina erased as the No. 3-ranked Tar Heels fought back to win 75-68, staying unbeaten in conference play.