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By observing the user's usage behavior, we found that there are no place for the shoehorn after we use it. Therefore, we often fail to find shoehorn when we need it.
We usually use shoehorn at the entrance or doorway, so we combine shoehorn with door handle. When we are finished using shoehorn, we can just plug it in the door handle. By
"Shoehorn Door", we can not only save space, but also easy to find a shoehorn.
Hung-Po Ou Yang,