user
Instruction
Answer the question based on the provided table.


Table
Table Title: Warwick Farm Racecourse
Table Content:
| Grp | Race Name | Age | Sex | Weight | Distance | Date |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | AJC Challenge Stakes | Open | Open | wfa | 1000 | March |
| 2 | Surround Stakes | 3YO | Fillies | sw | 1400 | March |
| 2 | Warwick Stakes | Open | Open | wfa | 1400 | August |
| 3 | Liverpool City Cup | Open | Open | qlty | 1300 | March |
| 3 | Silver Shadow Stakes | 3YO | Fillies | swp | 1200 | August |
| 3 | Up And Coming Stakes | 3YO | C&G | swp | 1200 | August |


Question
how many different group races are there at warwick farm racecourse?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["6"]