public static void Test()
{
var lhm = new LinkedHashMap <char, int>();
lhm['a'] = 1;
lhm['b'] = 2;
lhm['c'] = 3;
Console.WriteLine(lhm['a']);
Console.WriteLine(lhm['b']);
Console.WriteLine(lhm['c']);
Console.WriteLine(lhm.PopFirst());
Console.WriteLine(lhm.PopFirst());
Console.WriteLine(lhm.PopFirst());
}
