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Sommerdag ved Roskilde Fjord ( Summer Day by Roskilde Fjord ) is an oil painting by the Danish artist L. A. Ring from 1900 .
 L. A. Ring
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 L. A. Ring