| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] a [adj] period | 136 |
|
| 2 | [adv prt] a [adj] period | 76 |
|
| 3 | over a [adj] period | 72 |
|
| 4 | over a [adj] period | 72 |
|
| 5 | [adv] a [adj] period | 58 |
|
| 6 | [adv] a long period | 43 |
|
| 7 | [adv] a long period | 41 |
|
| 8 | only a [adj] period | 25 |
|
| 9 | only a [adj] period | 25 |
|
| 10 | [adv] a short period | 22 |
|
| 11 | [adv] a short period | 22 |
|
| 12 | quite a [adj] period | 11 |
|
| 13 | quite a [adj] period | 11 |
|
| 14 | [adv] a limited period | 5 |
|
| 15 | [adv] a limited period | 5 |
|
