| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period and | 53 |
|
| 2 | a long period and | 14 |
|
| 3 | a long period and | 11 |
|
| 4 | a short period and | 8 |
|
| 5 | a short period and | 6 |
|
| 6 | a limited period and | 5 |
|
| 7 | a [adj -er] period and | 5 |
|
| 8 | a limited period and | 5 |
|
