gistfile1.txt

  def dsortNat[A](z: NatOrd, xs: Stream[(Int,A)]): Stream[Stream[A]] = {
     val arr = new Array[MutableList[A]](z.i+1)
     xs.foreach { arg: (Int,A) =>
        val idx = arg._1
        if(arr(idx) == null) arr(idx) = MutableList[A](arg._2)
        else arr(idx) += arg._2
     }
     arr.toStream.filter(_ != null).map(_.toStream)
  }