| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduced [prep] the [num ord] time | 10 |
|
| 2 | introduced for [art] [num ord] time | 10 |
|
| 3 | introduced [prep] [art] first time | 10 |
|
| 4 | introduced [prep] the [num ord] time | 10 |
|
| 5 | introduced [prep] [art] [num ord] time | 10 |
|
