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The use of emoticons can be traced back to the 17th century , drawn by a Slovak notary to indicate his satisfaction with the state of his town 's municipal financial records in 1635 , but they were commonly used in casual and humorous writing .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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