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for a week now , protesters have been clashing with police and backers of the clerical regime in tehran .
 tehran, the clerical regime, protesters, police, backers of the clerical regime
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 tehran, the clerical regime, protesters, police, backers of the clerical regime