PHILADELPHIA — At the start of the season, a photo of the Superdome was put on the locker of each Carolina player to remind them of the end goal — a trip to the Final Four. After two difficult seasons and a lot of frustrations, most college basketball observers saw that as an unrealistic, lofty goal at the time. Throughout the ups and downs when many fans and the media gave up on the Tar Heels, junior center Armando Bacot said that the team stayed focused and believed it was possible.