static void Main(string[] args)
{
MultiDictionary <FirstToDictionary, StringBuilder> dictionary = new MultiDictionary <FirstToDictionary, StringBuilder>();
FirstToDictionary first;
first.number = 1;
dictionary.CreateNewValue(first);
foreach (var item in dictionary.Values)
{
Console.WriteLine($"{item}");
}
Console.WriteLine(dictionary.Count());
}
