| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long [noun sg] period | 10 |
|
| 2 | [prep] a long [noun sg] period | 10 |
|
| 3 | after a long [noun sg] period | 5 |
|
| 4 | after a long [noun sg] period | 5 |
|
