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Young John was educated at Tusculum Academy under famed frontier preacher Samuel Doak , and read law with Judge Samuel Powell .
 Tusculum Academy, Samuel Doak, Samuel Powell
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tusculum Academy, Samuel Doak, Samuel Powell