| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | after [art] long period of [noun sg] | 10 |
|
| 2 | after [art] long period of [noun sg] | 10 |
|
| 3 | after a long period of [noun sg] | 9 |
|
| 4 | after a long period of [noun sg] | 9 |
|
