| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] up [prep] a period | 10 |
|
| 2 | [vb pp] up [prep] a period | 10 |
|
| 3 | [vb pp] up [prep] a period | 10 |
|
| 4 | built up [prep] a period | 6 |
|
| 5 | [vb pp] up over a period | 5 |
|
