| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] [prep] the | 14418 |
|
| 2 | introduced [prep] the | 1099 |
|
| 3 | [was/were] introduced [prep] | 978 |
|
| 4 | [was/were] introduced the | 6 |
|
