| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] must [be] referred | 13 |
|
| 2 | [noun sg] must [be] referred | 10 |
|
| 3 | [pron] must [be] referred | 6 |
|
| 4 | must [be] referred [prep] | 20 |
|
| 5 | must [be] referred [prep] | 20 |
|
| 6 | must [be] referred to | 17 |
|
| 7 | must [be] referred to | 17 |
|
