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He painted numerous studies , across seasons , of the Arno in Florence , and of the Gabbro near Livorno , and of the railway line of the Apennine Porrettano , and of the Maremma Toscana .
 Florence
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Florence