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The cellos of Stradivari , for example , can be clearly divided into two models : the style made before 1702 , characterized by larger instruments ( of which only three exist in their original size and configuration ) , and the style made during and after 1707 , when Stradivari began making smaller cellos .
 Stradivari, Stradivari
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stradivari, Stradivari