static void Main()
{
BiDictionary<int, string, string> dictionary = new BiDictionary<int, string, string>();
dictionary.Add(0, "Zero");
dictionary.Associate("0000", 0);
dictionary.Add(3, "0011", "Three");
string value = dictionary["0000"]; // value will be "Zero"
Console.WriteLine(value);
value = dictionary[0]; // val will be "Zero"
Console.WriteLine(value);
}