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Sometimes we find that there is not any toilet paper left in the restroom when we are just about to use it. This situation could be very disturbing so we try to find an easy way to avoid it.
That is, when the toilet paper is about to run out the CD line would appear more intensively. This way, users are reminded that it is time to refill the paper. It could be used in public places or at home.
SIOU-HONG,YAN YI-SING,CHEN YI-JIE,ZENG