| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a number of [noun pl] | 77 |
|
| 2 | at the number of [noun pl] | 23 |
|
| 3 | at [art] number of levels | 17 |
|
| 4 | at [art] number of points | 10 |
|
| 5 | at [art] number of sites | 5 |
|
