// Loop demo -- can you figure out what the output will be?

public class Demo1
{
  public static void main(String [] args)
  {
    // before doing anything, let's declare our counter variables
    // We cusomarily use i and j for names, or "row" and "col"
    int i, j;

    for (i = 1; i <= 9; ++i)
    {
      for (j = 1; j <= 9; ++j)
      {
        if (j >= 4 && j <= 7)
          continue;

        System.out.printf("%d  ", 10*i + j);
      }
      System.out.printf("\n");
    }
  }
}