| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | that [pron] [vb past] [pers pn] difficult | 6 |
|
| 2 | [that] [pers pn] [vb past] [pers pn] difficult | 6 |
|
| 3 | [that] [pron] [vb past] it difficult | 6 |
|
| 4 | [that] [pron] found [pers pn] difficult | 6 |
|
