using System;
public class Test
{
public static void Main()
{
string[] stArray = new string[] { "A", "B", "C" , "D" };
string temp = stArray[2];
stArray[2] = stArray[1];
stArray[1] = temp;
for(int i = 0; i < stArray.Length; ++i)
Console.Write(stArray[i]);
}
}
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