| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | follow up period [prep] | 6 |
|
| 2 | [verb] up period [prep] | 6 |
|
| 3 | [vb base] up period [prep] | 6 |
|
| 4 | follow up period [prep] | 6 |
|
