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Gradaion nails give information us how long nail is inside the wall.
Chung-Ang Univercity
Anseong-si, Gyeonggi-do, South Korea
Won Kyung Kim
Chung-Ang Univercity
Anseong-si, Gyeonggi-do, South Korea
Mina Namgung, janwoon Kim, Eunsil Mok
