#tricycle__trike__velocipede  a cycle with three wheels
  supertype:  #cycle.wheeled_vehicle  a shortened version of `bicycle' or `tricycle' or `motorcycle'
  subtype:  #pedicab__cycle_rickshaw__cyclerickshaw  a tricycle (usually propelled by pedalling); used in the Orient for transporting passengers for hire; "boys who once pulled rickshaws now pedal pedicabs"

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