| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduce at [art] [det] time | 8 |
|
| 2 | introduce at the [det] time | 8 |
|
| 3 | introduce at the [det] time | 8 |
|
| 4 | introduce at [art] same time | 8 |
|
| 5 | introduce at [art] [det] time | 8 |
|
| 6 | introduced at [art] [det] time | 7 |
|
