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The rival Kurdistan Democratic Party ( KDP ) , which accuses Iran of supporting the PUK , said on Thursday that its forces had halted an Iranian-backed attack by thousands of PUK fighters .
 PUK, PUK, Kurdistan Democratic Party, Iran, KDP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 PUK, PUK, Kurdistan Democratic Party, Iran, KDP