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A " Christmas tree " is a decorated tree , usually an evergreen conifer , such as a spruce , pine or fir , or an artificial tree of similar appearance , associated with the celebration of Christmas , originating in Northern Europe .
 Northern Europe
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Northern Europe