| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a long period | 102 |
|
| 2 | [noun sg] [prep] a [adv] long | 84 |
|
| 3 | [prep] a [adv] long period | 24 |
|
| 4 | [noun sg] [prep] [adv] long period | 13 |
|
