| 1 | There are some impurities in food. | |
| 2 | Workers are removing impurities from silver. | |
| 3 | These use carbon or mesh to catch impurities. | |
| 4 | The workers' job was to remove impurities from the silver. | |
| 5 | What remains in the filter is a mixture of various metals and impurities. |
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