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Sophia Holmstedt belonged to the pioneer-troupe of Swedish ballet dancers employed at the Royal Swedish Ballet upon its foundation in Bollhuset 1773 .
 Sophia Holmstedt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sophia Holmstedt