Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Date | Time | Opponent# | Rank# | Site | TV | Result | Attendance |
| --- | --- | --- | --- | --- | --- | --- | --- |
| September 1 | 2:30 PM | Nevada* | #19 | Memorial Stadium • Lincoln, NE | ABC | W 52–10 | 84,078 |
| September 8 | 11:00 AM | at Wake Forest* | #17 | BB&T Field • Winston-Salem, NC | ESPN | W 20–17 | 32,483 |
| September 15 | 7:00 PM | #1 USC* | #14 | Memorial Stadium • Lincoln, NE | ABC | L 31–49 | 84,959 |
| September 22 | 11:30 AM | Ball State* | #22 | Memorial Stadium • Lincoln, NE | FSN PPV | W 41–40 | 84,294 |
| September 29 | 1:05 PM | Iowa State | #22 | Memorial Stadium • Lincoln, NE |  | W 35–17 | 84,703 |
| October 6 | 8:15 PM | at #17 Missouri | #23 | Faurot Field • Columbia, MO (Rivalry) | ESPN | L 6–41 | 70,049 |
| October 13 | 11:30 AM | Oklahoma State |  | Memorial Stadium • Lincoln, NE | PPV | L 14–45 | 84,334 |
| October 20 | 1:05 PM | Texas A&M |  | Memorial Stadium • Lincoln, NE |  | L 14–36 | 84,473 |
| October 27 | 2:30 PM | at #16 Texas |  | Darrell K Royal–Texas Memorial Stadium • Austin, TX | ABC | L 25–28 | 85,968 |
| November 3 | 11:30 AM | at #8 Kansas |  | Memorial Stadium • Lawrence, KS | FSN | L 39–76 | 51,910 |
| November 10 | 11:30 AM | Kansas State |  | Memorial Stadium • Lincoln, NE | Versus | W 73–31 | 84,665 |
| November 23 | 11:00 AM | at Colorado |  | Folsom Field • Boulder, CO (Rivalry) | ABC | L 51–65 | 51,403 |
Question:
how many sites are there?
Answer:
6