if (key == -999)
} } if (key == -999) {
  public int hashCode()    {      int hv = 0;      if (key != -999)	return key;      for (int i=0;i<attributes.length;i++)	if (missing[i])	  hv += (i*13);	else	  hv += (i * 5 * (attributes[i]+1));      if (key == -999)	key = hv;      return hv;    }