| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [adv] [prep] a long | 69 |
|
| 2 | [vb pp] [prep] a long period | 67 |
|
| 3 | [vb pp] [adv] [prep] a period | 39 |
|
| 4 | [adv] [prep] a long period | 36 |
|
| 5 | [vb pp] [adv] [prep] long period | 6 |
|
