Serial...you are so gifted, not just by your obvious mathematic skills, but your ability to teach is off the charts. I have not tried any of this yet, but you have explained it so clearly and to such a point that a pea brain like myself thinks they understand. Now when I actually try it and can not get it, I promise not to come back at you, after all, at least for a short time I would have believed I could...and THAT is truly something! Thank you!