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The most important cities in this region , which serve as the provinces ' administrative centers , are Bilbao ( in Biscay ) , San Sebastián ( in Gipuzkoa ) and Vitoria-Gasteiz ( in Álava ) .
 Bilbao, Biscay, San Sebastián, Gipuzkoa, Vitoria-Gasteiz, Álava
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bilbao, Biscay, San Sebastián, Gipuzkoa, Vitoria-Gasteiz, Álava