| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] a [adj] period | 87 |
|
| 2 | [conj] a longer [noun] | 39 |
|
| 3 | [conj] a long period | 12 |
|
| 4 | [conj] a [adj -er] period | 12 |
|
| 5 | [conj] [art] longer period | 9 |
|
