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public static void Shuffle<T>(this IList<T> list){
    var count = list.Count;
    var lastElement = count - 1;
    for (var i = 0; i < lastElement; ++i)
    {
      var r = UnityEngine.Random.Range(i, count);
      var tmp = list[i];
      list[i] = list[r];
      list[r] = tmp;
    }
  }