| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] over a long period [prep] | 17 |
|
| 2 | [vb pp] over a long [noun sg] [prep] | 16 |
|
| 3 | [verb] over a long [noun sg] of | 15 |
|
| 4 | [verb] over a long [noun sg] [prep] | 14 |
|
