| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be introduced for the [num ord] time | 6 |
|
| 2 | be introduced for the [num ord] time | 6 |
|
| 3 | be introduced [prep] the [num ord] time | 6 |
|
| 4 | be introduced [prep] the [num ord] time | 6 |
|
| 5 | be introduced [prep] the first time | 6 |
|
