Cornell Duncan. The guys call him Dunk, but he couldn't dunk from a six-foot ladder. He's flat-footed and slow and jumps about two inches. But put him at the foul line and he doesn't miss. That's a big part of the reason he makes the YMCA's all-star basketball team going to the state tournament.Three days at the New Jersey shore - if the team keeps winning, that is. Dunk would like nothing better. But it takes a few disastrous minutes off the bench for him to realize that it'll take more than free throws to make him a real all-star.