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Sometimes when we used to pick a book from the shelf,
we usually are annoied by the folling down of the rest of
the book.They will nothing but slid. However, with a
invisible line ,which is flaxible, the book will not be slid down.
Furthermore, you dont have to use a hand to move the
rest anymore. The book hand was designed in a I-shape to stand on a plane.
You can put books as many as you could between it. By the friction
you made, the book hand will absorb the books, instead of falling