| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] of a long period | 12 |
|
| 2 | [noun sg] of a long period | 10 |
|
| 3 | of a long period of | 11 |
|
| 4 | of a long period of | 11 |
|
| 5 | of a long period [prep] | 11 |
|
| 6 | of a long period [prep] | 11 |
|
