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The area is full with medieval castles , including some very notable early ones in the Aosta Valley and Piedmont , and Renaissance ones in Lombardy .
 Aosta Valley, Piedmont, Lombardy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aosta Valley, Piedmont, Lombardy