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If you usually use the erasers,you will probably be annoyed by the cover of eraser.
That is,when the cover is beyond the eraser,we need to cut off it or fold it.
To solve the problem,we can mark the trim lineon the cover,so that we can rip the cover off easily.
Liao Jian Kai
Taipei, Taiwan
Liao Jian Kai,
TransWorld University
yi-bin Ciou,
TransWorld University