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Henrikson 's published production includes over 100 books including collections of poetry , history books retelling the history of , among others , Sweden , Denmark , China , Iceland and ancient Greece and Rome , and a general encyclopedia , which Henrikson started writing at the age of 80 .
 Henrikson, Henrikson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Henrikson, Henrikson