user
Instruction
Answer the question based on the provided table.


Table
Table Title: Cheltenham Town F.C.
Table Content:
| Year | Kit Manufacturer | Shirt Sponsor | Back of Shirt Sponsor | Short Sponsor |
| --- | --- | --- | --- | --- |
| 1977–1978 |  | National Express |  |  |
| 1982–1985 | Umbro |  |  |  |
| 1985–1986 | Umbro | Whitbread |  |  |
| 1986–1988 | Henson | Duraflex |  |  |
| 1988–1989 |  | Gulf Oil |  |  |
| 1991–1993 | Technik | Gulf Oil |  |  |
| 1993–1994 | Club Sport | Gulf Oil |  |  |
| 1994–1995 | Klūb Sport | Empress |  |  |
| 1995–1996 | Matchwinner | Empress |  |  |
| 1996–1997 | UK | Endsleigh Insurance |  |  |
| 1997–1999 | Errea | Endsleigh Insurance |  |  |
| 1999–2004 | Errea | Towergate Insurance |  |  |
| 2004–2008 | Errea | Bence Building Merchants |  |  |
| 2008– | Errea | Mira Showers |  |  |
| 2009–2011 | Errea | Mira Showers | PSU Technology Group |  |
| 2011–2013 | Errea | Mira Showers | Barr Stadia | Gloucestershire Echo |
| 2013– | Errea | Mira Showers | Gloucestershire College | Gloucestershire Echo |


Question
how many different kit manufacturers are listed?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["8"]