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FILE -- In this Jan. 9, 2008 file photo, Dallas Mavericks coach Avery Johnson directs his team during the second half of an NBA basketball game against the Dallas Mavericks, in Dallas. Avery Johnson won't be joining the Detroit Pistons as head coach. A person familiar with the negotiations told The Associated Press on Tuesday that the two sides failed to agree on the length of a contract and the salary. The person spoke on condition of anonymity because the talks were private. (AP Photo/Matt Slocum, File)