| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] could account [prep] [det] | 5 |
|
| 2 | could [not/n't] account [prep] [det] | 5 |
|
| 3 | could not account [prep] [det] | 5 |
|
| 4 | could [adv] account [prep] [det] | 5 |
|
