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AMENDMENT #4 TO AGREEMENT GROUP #3712 - AMEND SUB-PARAGRAPH 2 OF PARAGRAPH 5.2 TO INCLUDE APPLICABLE IF SERVICES ARE PROVIDED BY NON-DELTA PPO DENTISTS FOR DIVISIONS 2002, 2003 & 2004 ONLY, EFFECTIVE 2/1/2011 (ASSISTANT CITY MANAGER SIGNED 4/27/2011)