| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduced [prep] the first [noun] | 20 |
|
| 2 | introduced [prep] the first [noun] | 20 |
|
| 3 | introduced [prep] the first [noun sg] | 20 |
|
| 4 | introduced [prep] the first time | 10 |
|
| 5 | introduced for the first [noun] | 10 |
|
| 6 | introduced [prep] the first time | 10 |
|
| 7 | introduced for the first [noun] | 10 |
|
| 8 | introduced in the first [noun] | 6 |
|
| 9 | introduced in the first [noun] | 6 |
|
