| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been [vb pp] over a [adj] period | 8 |
|
| 2 | been [vb pp] over [art] [adj] period | 8 |
|
| 3 | been [vb pp] over [art] [adj] period | 8 |
|
| 4 | been [vb pp] over a [adj] period | 8 |
|
| 5 | been [vb pp] over [art] [adj] period | 8 |
|
| 6 | been [vb pp] over [art] long period | 5 |
|
| 7 | been [vb pp] over [art] long period | 5 |
|
