public static void Main()
{
var tuple = new BiDictionary <string, string, string>();
tuple.Add("Pesho", "Peshov", "*****@*****.**");
tuple.Add("Gosho", "Goshov", "*****@*****.**");
tuple.Add("Tosho", "Toshov", "*****@*****.**");
var pesho = tuple.FindByKey1("Pesho");
Console.WriteLine(pesho);
var gosho = tuple.FindByKey2("Goshov");
Console.WriteLine(gosho);
var tosho = tuple.FindByTwoKeys("Tosho", "Toshov");
Console.WriteLine(tosho);
}