Yes manufacturing issues arise, we just don't believe they arise at this stage of the game. They have been making parts for at least a month before the event. And when they do run into yield issues, they parachute in a battalion of engineers to figure it out and get things back on track because you can't make money off a phone you can't manufacture. As well, it wouldn't surprise me to find out that suppliers face penalties if yield falters and slows down the whole process. So when they commit to Apple, they know they must keep the commitment and if an issue arises it's dealt with very quickly.