| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be introduced [prep] the first [noun sg] | 11 |
|
| 2 | be introduced [prep] the first time | 6 |
|
| 3 | be introduced for the first [noun] | 6 |
|
| 4 | be introduced [prep] the first time | 6 |
|
