| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] a [noun] | 27903 |
|
| 2 | [vb -s] introduced a | 128 |
|
| 3 | introduced a [noun] | 120 |
|
| 4 | [vb -s] introduced [noun] | 72 |
|
