Arch type accounts for 5% (5 main types): no intersection

• AS: ridges stacked layer by layer, no center, no intersection.
• AT: axial symmetry like a hut.
• AE: combination of whorl group with arch, the distance from the center to the intersection of the eagle is less than 5 ridges.
• AU, AR: combination of loop group with arch, distance from center to intersection is less than 5 ridges, AU is forward water, AR is reverse water.

Reference

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