| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | could [be] due to | 45 |
|
| 2 | [noun] could [be] due | 22 |
|
| 3 | [noun] could [be] to | 11 |
|
| 4 | [noun] [be] due to | 10 |
|
