2. The book structure of claim 1, including an extension portion extending from at least one edge of each said memo portion, each said extension portion being separated from a respective said memo portion by a second scoring line, whereby each of said extension portions may be folded over at a respective one of said second scoring lines to be in alignment with said stack of single sheets.
2. The book structure of claim 1, including an extension portion extending from at least one edge of each said memo portion, each said extension portion being separated from a respective said memo portion by a second scoring line, whereby each of said extension portions may be folded over at a respective one of said second scoring lines to be in alignment with said stack of single sheets. 3. The book structure of claim 2, including one of said extension portions extending from at least two edges of each said memo portion.