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