#stream__watercourse  a natural body of running water flowing on or under the earth
  supertype:  #body_of_water__water  the part of the earth's surface covered with water (such as a river or lake or ocean); "they invaded our territorial waters"; "they were sitting by the water's edge"
  subtype:  #branch.stream  #brook  #river  #rivulet  #tidal_river
  part:  #ford__crossing  a shallow area in a stream that can be forded
  part:  #meander  a curve in a stream
  part:  #midstream  the middle of a stream

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