| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [been] [verb] at the | 713 |
|
| 2 | [been] [vb pp] at the | 566 |
|
| 3 | [been] introduced [prep] the | 106 |
|
| 4 | [be] introduced at the | 31 |
|
| 5 | [been] introduced at [art] | 9 |
|
| 6 | [been] introduce at the | 8 |
|
