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Thus far, the Boston Celtics have been riding a rollercoaster of wins and losses. As the ride begins another plunge, they would like to stop and get off. The Celtics visit the Cleveland Cavaliers in Tuesday’s best NBA game, hoping to avenge their inexplicable last-second home loss Sunday. Boston held an 11-point lead with 4 1/2 minutes to play and appeared to be headed for a fifth straight win. However, the ride took an unexpected sudden turn as the Cavaliers scored the