| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] force at [art] time of | 7 |
|
| 2 | [prep] force at [art] time of | 7 |
|
| 3 | in force at [art] time of | 6 |
|
| 4 | in force at [art] time of | 6 |
|
