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int id1;
  char cd1;

  for (id1=0; id1<4; id1++) {
      for (cd1='A'; cd1<='Z'; cd1++) printf("%c ", cd1);
      printf("\n");
  }
  
  ///////
  
  int id1, id2;
  char cd1;

  for (id1=0; id1<5; id1++) {
      for (cd1='a'; cd1<='f'; cd1++) {
           for (id2=0; id2<3; id2++) printf("%c ", cd1);          
      }
       printf("\n");
  }
  
  ////////
  
  for (int i=1; i <3; i++) 
    for (int j=1; j<4; j++) 
      for (int k=1; k<4; k++) 
      { 
        Console.WriteLine(i.ToString() + j.ToString() + k.ToString()); 
      }
      
  //////////
  
  for (int i = 0; i < 11; i++)
            {
                for (int j = 0; j < 11; j++)
                {
                    if (i == 0 || j == 0 || i == 10 || j == 10)
                    {
                        Console.Write("*");
                    }
                    else
                        Console.Write(" ");
                }
                Console.WriteLine();
            }