| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] a long period | 34 |
|
| 2 | [verb] [art] long period | 31 |
|
| 3 | [vb pp] [art] long period | 10 |
|
| 4 | [vb past] [art] long period | 10 |
|
| 5 | [verb] [art] longer period | 9 |
|
| 6 | [verb] the long period | 6 |
|
| 7 | have [art] long period | 6 |
|
| 8 | [to-vb] [art] long period | 6 |
|
| 9 | follow [art] long period | 5 |
|
| 10 | [vb infin] [art] long period | 5 |
|
