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using System;
namespace Concatenate{
public class Program{
public static void Main()
{
string firstWord = "Hello";
string secondWord = " World!";
string concatenated = firstWord + secondWord;
Console.WriteLine(concatenated);
}
}
}
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string str1 = "ppp";
string strRes = str1.Insert(2, "bbb");
Console.WriteLine(strRes.ToString());