| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a long period [prep] [pron] | 8 |
|
| 2 | a long period [prep] which | 7 |
|
| 3 | a long period [prep] which | 7 |
|
| 4 | a long period [prep] [Wh det] | 7 |
|
