| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was introduced [prep] the | 180 |
|
| 2 | was introduce to the | 48 |
|
| 3 | was introduce in the | 42 |
|
| 4 | was introduce by the | 27 |
|
| 5 | was introduce into the | 25 |
|
| 6 | was introduce for the | 8 |
|
| 7 | was introduce at the | 7 |
|
| 8 | was introduce through the | 5 |
|
