| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | policy have [been] [to-vb] | 21 |
|
| 2 | policy have been [to-vb] | 21 |
|
| 3 | policy has [been] [to-vb] | 16 |
|
| 4 | policy had [been] [to-vb] | 5 |
|
