| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been at the forefront | 39 |
|
| 2 | be at the forefront | 27 |
|
| 3 | is at the forefront | 26 |
|
| 4 | were at the forefront | 20 |
|
| 5 | are at the forefront | 16 |
|
| 6 | was at the forefront | 13 |
|
