#bicycle__bike__wheel  a cycle that has two wheels; moved by foot pedals
  supertype:  cycle.wheeled_vehicle  a shortened version of `bicycle' or `tricycle' or `motorcycle'
  part:  bicycle_seat  bicycle_wheel  chain.ligament  coaster_brake  handlebar  mudguard  foot_pedal  sprocket_wheel
  subtype:  bicycle-built-for-two__bicyclebuiltfortwo__tandem_bicycle__tandem  a bicycle with two sets of pedals and two seats
  subtype:  mountain_bike__all-terrain_bike__allterrainbike__off-roader__offroader  a bicycle with a sturdy frame and fat tires; originally designed for riding in mountainous country
  subtype:  ordinary_bicycle__ordinary  an early bicycle with a very large front wheel and small back wheel
  subtype:  push-bike  (British) a bicycle that must be pedaled
  subtype:  safety_bicycle__safety_bike  bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear
  subtype:  velocipede  any of several early bicycles with pedals on the front wheel

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