| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduced [prep] [art] first [noun sg] | 20 |
|
| 2 | introduced [prep] the first [noun sg] | 20 |
|
| 3 | introduced [prep] [art] first time | 10 |
|
| 4 | introduced for [art] first [noun sg] | 10 |
|
| 5 | introduced in [art] first [noun sg] | 6 |
|
