| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [was/were] introduced [prep] the [num ord] | 21 |
|
| 2 | was introduce [prep] the [num ord] | 14 |
|
| 3 | [was/were] introduce in the [num ord] | 12 |
|
| 4 | [was/were] introduce [prep] the first | 8 |
|
| 5 | were introduce [prep] the [num ord] | 8 |
|
