#avocation__by-line__hobby__sideline__spare-time_activity  an auxiliary activity
  supertype:  pastime__interest  a subject or pursuit that occupies one's time and thoughts (usually pleasantly): "sailing is her favorite pastime"; "his main pastime is gambling"; "he counts reading among his interests"; "they criticized the boy for his limited interests"
  subtype:  speleology__spelaeology  the pastime of exploring caves

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