| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | keep a firm [noun] on [pos pn] | 7 |
|
| 2 | keep [art] firm [noun] on [pos pn] | 7 |
|
| 3 | keep a firm [noun] on [pos pn] | 7 |
|
| 4 | keep [art] firm [noun sg] on [pos pn] | 7 |
|
