| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [adv] introduced [prep] the | 27 |
|
| 2 | was [adv] introduced [prep] the | 20 |
|
| 3 | [was/were] [adv] introduced to the | 8 |
|
| 4 | were [adv] introduced [prep] the | 7 |
|
| 5 | [was/were] [adv] introduced into the | 6 |
|
| 6 | [was/were] [adv] introduced in the | 5 |
|
| 7 | [was/were] also introduced [prep] the | 5 |
|
