- From the corner, measure horizontally the length of one front flap and make a mark. This is point a.
- From point a, measure horizontally the width of the object and make a mark. This is point b.
- From point b, measure horizontally the length of the object and make a mark. This is point c.
- From point c, measure horizontally the width of the object and make a mark. This is point d.
- From point d, measure horizontally the length of the second front flap and make a mark. This is point e.
- Returning to the bottom left corner, measure verically the height of the bottom front flap and make a mark. This is point f.
- From point f, measure vertically the width of the object and make a mark. This is point g.
- From point g, measure vertically the height of the object and make a mark. This is point h.
- Draw a line from each point perpendicular to the edge. That is, points a through e will have vertical lines drawn and points f through h will have horizontal lines.
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