static public boolean isInPowerArray( String x, int i, String y )
{
    String[] veldisfylki = powerArray(x);
       if (veldisfylki[i].equals(y))
    {
        return true;
    }
    else
    {
        return false;
    }
}
static public String[] powerArray( String x )
{
String[] powerArray = new String[(int) Math.pow(2, x.length())];
    for (int i = 0; i < x.length(); i++)
    {
          powerArray[i] = "";



        for (int j = 1; j < powerArray.length; j++)
        {
         powerArray[j] += "" +  x.charAt(i);
        }

    }
  return powerArray;
  }

public static void sort( String[] a )
{
java.util.Arrays.sort(a);
}