| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although it be not known [conj] | 7 |
|
| 2 | although it is not known [conj] | 6 |
|
| 3 | although it [be] not known [subord] | 6 |
|
| 4 | although it [is] not known [conj] | 6 |
|
