OK, I royally messed up my first effort last night because the boxes didn't delete when I changed my mind about their shapes. Blech.
My double boxes aside, this is a great app.
And Dave, you can delete my first effort, think it's Set #20, just anytime now. I know what I'm doing now and will get the boxes right the first time, next time. I hope. Unless I change my mind. Again.
