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17. Sew through the second hole from inside the signature, as you did the first, and once again wrap around the cover. Sew through the second hole in the cover and then back through the second hole in the signature. Pull the thread through. Repeat this step until you get to the last hole.
18. At the last hole, sew through from the inside of the signature and wrap around the cover and through the hole as before, but instead of sewing back into the signature, connect the second signature, by sewing through its top hole (fig. N).