| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] approach have [been] [to-vb] | 12 |
|
| 2 | [adj] approach have [been] [to-vb] | 9 |
|
| 3 | approach have [been] [vb pp] [to-vb] | 7 |
|
| 4 | approach have [been] [verb] [to-vb] | 7 |
|
