| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | build up [prep] [art] period of | 5 |
|
| 2 | build up [prep] [art] period of | 5 |
|
| 3 | build up [prep] [art] period [prep] | 5 |
|
| 4 | build up over [art] period [prep] | 5 |
|
| 5 | build up [prep] [art] period [prep] | 5 |
|
| 6 | build up [prep] [art] period [prep] | 5 |
|
