| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period | 137 |
|
| 2 | [noun sg] [prep] a long period | 102 |
|
| 3 | [noun sg] [noun] [prep] a long | 91 |
|
| 4 | [noun sg] [noun] [prep] a period | 85 |
|
