| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | been introduce [prep] [art] [noun prp] | 18 |
|
| 2 | been introduced [prep] [art] [noun prp] | 18 |
|
| 3 | been introduce [prep] the [noun prp] | 17 |
|
| 4 | been introduce [prep] the [noun prp] | 17 |
|
| 5 | been introduce into [art] [noun prp] | 5 |
|
