| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] authorities have a duty | 12 |
|
| 2 | [adj] authorities have a duty | 12 |
|
| 3 | local authorities have a duty | 12 |
|
| 4 | local authorities have a duty | 12 |
|
| 5 | authorities have a [adj] duty | 6 |
|
| 6 | authorities have a [adj] duty | 6 |
|
| 7 | authorities have a duty [to-vb] | 14 |
|
| 8 | authorities have a duty [verb] | 14 |
|
