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def decode[A](xs: List[(Int, A)]) : Seq[A] = xs match {
case Nil => Nil
case (times, code) :: xs => (for (i <- 1 to times) yield code) ::: decode(xs)
// you may also replace
// (for (i <- 1 to times) yield code)
// with
// Seq.fill(3)(code)
// so you will get
// case (times, code) :: xs => Seq.fill(times)(code) ::: decode(xs)
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