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Carlos Pérez Álvarez ( 1 November 1971 – 5 July 2006 ) was a Spanish footballer who played as a central midfielder .
 Carlos Pérez Álvarez, Spanish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Carlos Pérez Álvarez, Spanish