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After the invasion the division settled in to conduct security and stabilization operations in Baghdad , Tikrit , and then in south-central Iraq from May to October 2003 .
 Baghdad, Tikrit, Iraq
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Baghdad, Tikrit, Iraq