sample1.scala

case class Area(code: String, name: String)
object Area {
  val Japan: Set[Area] = Set(
    Area("01", "北海道"),
    Area("02", "青森県")
    // ...
  )

  val Us: Set[Area] = Set(
    Area("AK", "Alaska")
    Area("AL", "Alabama")
    // ...
  )
}


case class Country(code: String, language: String, name: String, areas: Set[Area])
object Country {

  val Japan = Country("JPN", "ja", "日本", Area.Japan)
  val Us = Country("USA", "en", "United States", Area.Us)


}