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data class Person(var name: String? = null,
                  var yearOfBirth: Int? = null,
                  var country: String? = null)

fun newPerson(init: Person.() -> Unit): Person {
  val person = Person()
  person.init()
  init(person)
  return person
}

fun person() = newPerson {
  name = "Fred"
  yearOfBirth = 1965
  country = "Sweden"
}

fun personApply() = Person().apply {
  name = "Fred"
  yearOfBirth = 1965
  country = "Sweden"
}