Figure 4A (PDF) shows a map of all the fold lines, using a bone folder or the wrong side of a butter knife, score the FOLD lines.**
** Scoring a piece adds a notch to the paper that makes it easier to fold. Place the ruler on the fold line and take the bone folder and run it along the length of the fold. If you do not have a bone folder you can use the back side (the un-serrated edge) of a butter knife. Do not press too hard, you do not want to rip or tear the paper.
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