Ok. My brain must have left me for some place better, because I can't get the math to come out to the final size of 66 x 77. If each section is 6" (6 1/2" unfinished) and it takes 4 to make a square, shouldn't the finish square equal 12 1/2" (12" finished)? So 6 sections (or 3 squares) across should equal 36 1/2"And even if I add in the borders , I still can't get close to the finished size. Could someone tell me where my math mistake is at or where my brain went? Thanks