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On the first day, only one grain was collected. TOTAL=1
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On the second day, 2 grains were collected. TOTAL=3
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On the 3rd day, 4 grains of rice were collected. TOTAL=7
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On the 4th day, 8 grains of rice were collected. TOTAL=15
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On the 5th day, 16 grains were collected. TOTAL=31
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