| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | which have been [verb] [prep] a | 198 |
|
| 2 | which have been [vb pp] [prep] a | 190 |
|
| 3 | [pron] have been described [prep] a | 25 |
|
| 4 | which have been described [prep] [art] | 13 |
|
| 5 | which have been described [prep] [art] | 13 |
|
| 6 | which have been described [prep] a | 6 |
|
| 7 | which have [been] described [prep] a | 5 |
|
| 8 | which have been describe [prep] a | 5 |
|
| 9 | which have [be] described [prep] a | 5 |
|
| 10 | which [verb] been described [prep] a | 5 |
|
| 11 | which have be described [prep] a | 5 |
|
