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While a member of the city council and as Mayor of San Mateo , Hill also served as a board member for San Mateo Transit District ( SamTrans ) and the Peninsula Corridor Joint Powers Authority ( Caltrain ) .
 Mateo, Mateo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mateo, Mateo