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Their rivalry resumed in the 1990s when they faced each other in Azadegan League seasons ( 1993/94 , 1996/97 , 1997/98 ) and from then on the two met each other twice a year .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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