| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | when it [verb] to produce | 6 |
|
| 2 | when it [verb] to produce | 6 |
|
| 3 | [subord] it [verb] to produce | 6 |
|
| 4 | [conj] it [verb] to produce | 6 |
|
