private void UpdateRepeats(Data data)
        {
            XmlSerializableDictionary <int, int> repeatsOfValue = XmlSerializableDictionary <int, int> .DeepCopy(RepeatsOfValues);

            foreach (var package in data.Prepared)
            {
                if (repeatsOfValue.ContainsKey(package.Value) == false)
                {
                    repeatsOfValue.Add(package.Value, 0);
                }
                repeatsOfValue[package.Value]++; // count repeats
            }
            RepeatsOfValues = repeatsOfValue;
        }