| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period | 305 |
|
| 2 | [prep] a long period | 305 |
|
| 3 | over a long period | 181 |
|
| 4 | over a long period | 181 |
|
| 5 | for a long period | 71 |
|
| 6 | for a long period | 71 |
|
| 7 | after a long period | 22 |
|
| 8 | after a long period | 22 |
|
| 9 | of a long period | 10 |
|
| 10 | of a long period | 10 |
|
| 11 | to a long period | 5 |
|
| 12 | to a long period | 5 |
|
| 13 | from a long period | 5 |
|
| 14 | from a long period | 5 |
|
