| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be kept confidential | 17 |
|
| 2 | [be] kept confidential | 17 |
|
| 3 | be kept confidential | 11 |
|
| 4 | [be] kept confidential | 11 |
|
| 5 | kept confidential [prep] | 6 |
|
| 6 | kept confidential [prep] | 6 |
|
