| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] to ensure the | 67 |
|
| 2 | [vb pp] to ensure a | 27 |
|
| 3 | taken to ensure [art] | 11 |
|
| 4 | designed to ensure [art] | 10 |
|
| 5 | made to ensure [art] | 7 |
|
| 6 | used to ensure [art] | 7 |
|
| 7 | required to ensure [art] | 7 |
|
