| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [conj] i do n't know | 8 |
|
| 2 | [is] that i do n't know | 6 |
|
| 3 | [is] that i do n't know | 6 |
|
| 4 | [is] [that] i do n't know | 6 |
|
