| 1 | The law repealed the previous policy. | |
| 2 | A subsequent ratification, which has a retrospective effect, is equivalent to a prior command. | |
| 3 | He had never seen such a high-quality product before. | |
| 4 | We need to learn from our previous mistakes to avoid making the same ones again. | |
| 5 | Previous research has shown that this medicine has side effects on the skin. |
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