user
Instruction
Answer the question based on the provided table.


Table
Table Title: Speed skating at the 1972 Winter Olympics
Table Content:
| Rank | Nation | Gold | Silver | Bronze | Total |
| --- | --- | --- | --- | --- | --- |
| 1 | Netherlands (NED) | 4 | 3 | 2 | 9 |
| 2 | United States (USA) | 2 | 1 | 1 | 4 |
| 3 | West Germany (FRG) | 2 | 0 | 0 | 2 |
| 4 | Norway (NOR) | 0 | 2 | 2 | 4 |
| 5 | Soviet Union (URS) | 0 | 1 | 2 | 3 |
| 6 | Sweden (SWE) | 0 | 1 | 1 | 2 |
|  | Total | 8 | 8 | 8 | 24 |


Question
how many countries have the same number of silver medals as the united states?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["2"]