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Boston Celtics head coach Doc Rivers argues a call with referee Bennett Salvatore during the second quarter in Game 6 of their first-round NBA basketball playoff series against the New York Knicks in Boston, Friday, May 3, 2013. (AP Photo/Charles Krupa)

Associated Press
Boston Celtics head coach Doc Rivers argues a call with referee Bennett Salvatore during the second quarter in Game 6 of their first-round NBA basketball playoff series against the New York Knicks in Boston, Friday, May 3, 2013. (AP Photo/Charles Krupa)
Boston Celtics head coach Doc Rivers argues a call with referee Bennett Salvatore during the second quarter in Game 6 of their first-round NBA basketball playoff series against the New York Knicks in Boston, Friday, May 3, 2013. (AP Photo/Charles Krupa)
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