public class Shuffle1
{
   public static int [] shuffle( int[] x )
   {
      int[] out = new int[52];
      int j = 0;

      for ( int i = 0; i < 26; i++ )
      {
         out[j++] = x[i];
         out[j++] = x[26+i];
      }

      return out;
   }

   public static void print( int[] x )
   {
      int k = 0;

      for ( int i = 0; i < 2; i++ )
      {
         for ( int j = 0; j < 26; j++ )
            System.out.print(x[k++] + " ");
         System.out.println();
      }
      System.out.println();
   }

   public static void main( String[] args )
   {
      int i;
      int[] x = new int[52];

      for ( i = 0; i < 52; i++ )
	 x[i] = i+1;

      System.out.println("Original deck:");
      print(x);

      for ( i = 0; i < 8; i++ )
      {
	  x = shuffle(x);
          System.out.println("After shuffle #" + i + ":");
	  print(x);
      }
   }
}