| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | the [noun sg] [prep] a long | 393 |
|
| 2 | the [noun sg] [prep] a period | 125 |
|
| 3 | [noun sg] [prep] a long period | 102 |
|
| 4 | the [noun sg] [prep] long period | 18 |
|
