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It is often happened in our life, which is because you want to record a few things but waste whole page of a notebook, therefore the paper cannot effectively use and there is a large number of blank.
If we have N/2 Notebook, this problem can be solved easily, we divided the paper into five parts and each part about 1/2 unit, in this case people need different demand will corresponding to the accuracy size if you wish, therefore we can avoiding the paper waste.