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Nice, except for one thing. Folds like you have would be created by folding the map, then opening it, and folding it again in the other direction. Far more likely is that it would be folded, and then folded in the other direction without opening it. This would result in the second fold going from 'in' to 'out' as it crosses the first.
Like this:
Attachment 13605
The horizontal fold is the second one. It is a ridge on the left, and a valley on the right while the vertical fold is a valley all the way along.
