| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although it is not [verb] | 26 |
|
| 2 | although it is [not/n't] [verb] | 26 |
|
| 3 | although it is [not/n't] [vb pp] | 23 |
|
| 4 | although it is [not/n't] known | 9 |
|
| 5 | although it is [not/n't] know | 9 |
|
