| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when [art] number of | 31 |
|
| 2 | when [art] number [prep] | 31 |
|
| 3 | when the number [prep] | 18 |
|
| 4 | when the number [prep] | 18 |
|
| 5 | when a number [prep] | 13 |
|
| 6 | when a number [prep] | 13 |
|
