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Sandberg became a student at the Royal Swedish Academy of Arts 's preparatory school ( Swedish : Konstakademiens principskola ) in 1794 .
 Sandberg, Royal Swedish Academy of Arts, Swedish
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sandberg, Royal Swedish Academy of Arts, Swedish