| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] up over [art] period | 9 |
|
| 2 | [verb] up over a period | 7 |
|
| 3 | build up over [art] period | 6 |
|
| 4 | [vb pp] up over [art] period | 5 |
|
| 5 | built up over [art] period | 5 |
|
