I looked at this thing for about 15 mins. this afternoon, then company showed up and I forgot all about it. I woke up at 3:00 am and this puzzle was on my mind, so I turned the computer back on and took another look at it. I couldn't believe how simple it was to figure out, I guess I was looking to hard. Now I can go back to sleep. GREAT MIND GAME!!!
P.S.: use the KISS method !
( Keep It Simple Stupid)