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Robert Louis Stevenson school is known as Samoa 's upper class school , due to many children of Samoa 's wealthy classes attending it .
 Robert Louis Stevenson, Samoa, Samoa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Louis Stevenson, Samoa, Samoa