user
Instruction
Answer the question based on the provided table.


Table
Table Title: Swatch FIVB World Tour 2007
Table Content:
| Rank | Nation | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- |
| 1. | Brazil | 21 | 9 | 12 | 42 |
| 2. | United States | 9 | 3 | 6 | 18 |
| 3. | China | 1 | 9 | 8 | 18 |
| 4. | Australia | 1 | 1 | 1 | 3 |
| 4. | Netherlands | 1 | 1 | 1 | 3 |
| 6. | Estonia | 1 | 0 | 0 | 1 |
| 7. | Germany | 0 | 5 | 1 | 6 |
| 8. | Russia | 0 | 2 | 3 | 5 |
| 9. | Argentina | 0 | 2 | 0 | 2 |
| 10. | Switzerland | 0 | 1 | 1 | 2 |
| 11. | Norway | 0 | 1 | 0 | 1 |
| 12. | Austria | 0 | 0 | 1 | 1 |


Question
what is the difference between the amount of bronze medals won by the us and the amount of silver medals?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["3"]