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Every early morning, dressing up with sleepy eyes, you walk through the passage,stand in the bathroom, squeeze the toothpaste on the toothbrush and then put it into your mouth. Suddenly, a drop of toothpaste falls on the ceramic tiles. At the same moment, you come to yourself, and with regretting for the drop of the toothpaste, you swear that you would not waste any of the toothpaste tomorrow. However, every moment will reappear as usual the next day.
Simon Fraser University
SURRY, VANCOUVER, Canada
Southwest Jiaotong University