| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduce at the [adj] time | 9 |
|
| 2 | introduce at the same time | 8 |
|
| 3 | introduced at the [adj] time | 8 |
|
| 4 | introduce at the same time | 8 |
|
| 5 | introduce at the [det] time | 8 |
|
