using System;
using System.Linq;
using System.Collections.Generic;
public class Test
{
public static String duplicateChars(IEnumerable<Char> input, int factor)
{
var chars = from c in input
from cc in Enumerable.Repeat(c, factor)
select cc;
return new String(chars.ToArray());
}
public static void Main()
{
Console.Write(duplicateChars("123", 2));
}
}
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