| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [vb past] to [be] introduced | 16 |
|
| 2 | [noun sg] [vb past] to [be] introduced | 8 |
|
| 3 | [noun pl] [vb past] to [be] introduced | 7 |
|
| 4 | [vb past] to [be] introduced [prep] | 11 |
|
| 5 | [vb past] to [be] introduced [prep] | 11 |
|
| 6 | [vb past] to [be] introduced in | 6 |
|
| 7 | [vb past] to [be] introduced in | 6 |
|
