| 1 | He was studying a substance in the hull that covers rice. | |
| 2 | We want to buy Rice Husk ash, Rice, Sugar and Other Commodities. | |
| 3 | Adding the ash makes concrete stronger and more resistant to corrosion. | |
| 4 | But the modern inventors say rice hull ash works better than other materials. | |
| 5 | But the modern inventors say rice hull ash works better than other materials. |
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