#area.topic  a subject of study; "it was his area of specialization"; "areas of interest include..."
  supertype:  #topic__subject__issue__matter  some situation or event that is thought about; "he kept drifting off the topic"; "he had been thinking about the subject for several years"; "it is a matter for the police"
  subtype:  #gray_area__grey_area  an intermediate area; a topic that is not clearly one thing or the other
  subtype:  #territory  an area of knowledge or interest; "his questions covered a lot of territory"

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