| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [prep] a [noun] | 73 |
|
| 2 | has been described [prep] [noun] | 52 |
|
| 3 | has been described [prep] a | 52 |
|
| 4 | been described [prep] a [noun] | 40 |
|
