docs: def origin_east_asia(origin):
      """\
      Returns if the origin is located in East Asia
  
      Holds true for the following countries:
          * China
          * Japan
          * Mongolia
          * South Korea
          * Taiwan
  
      `origin`
          The origin to check.
      """
      return origin_china(origin) or origin_japan(origin) \
             or origin_mongolia(origin) or origin_south_korea(origin) \
             or origin_taiwan(origin)