using System;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
class Program
{
static void Main()
{
var letters = new SortedSet<char>("java2s.com");
foreach (char c in letters)
Console.Write(c);
}
}
The output:
.2acjmosv
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