public static void Main()
{Console.WriteLine("Kelas" + a + ".A \t" + "Kelas" + a + ".B \t" + "Kelas" + a + ".C \t" + "Kelas" + a + ".D"); a++;}
{Console.WriteLine();a++;}
{ Console.WriteLine("Kelas" + a + ".D \t" + "Kelas" + a + ".C \t" + "Kelas" + a + ".B \t" + "Kelas" + a + ".A"); a++; }
{ Console.WriteLine("Kelas" + a + ".D\t" + "Kelas" + a + ".C\t" + "Kelas" + a + ".B\t" + "Kelas" + a + ".A"); a++;}