Well, I have actually learned something this morning. David De - Paulie wrote and asked "if I knew that the Chambon Strip that was described on July 3rd actually created 10 different se-tenant pairs?"
This is something I have never given a thought to, but looking at it I can now see his point of view. The gutter pair strip configuration from left to right gives an extra (possible) 10 vertical pairs if you include the partially printed labels with markings above or below the stamps.
Thanks David for your observations.
Any more tips or comments? They are all welcome.