| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | although it is difficult [verb] [adv] | 8 |
|
| 2 | although it is difficult [verb] how | 5 |
|
| 3 | although it is difficult [verb] how | 5 |
|
| 4 | although it is difficult [verb] [art] | 5 |
|
| 5 | although it is difficult [verb] [Wh adv] | 5 |
|
| 6 | although it is difficult [verb] [adj] | 5 |
|
| 7 | although it is difficult [verb] [art] | 5 |
|
