| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | have been describe in | 121 |
|
| 2 | have been described in | 119 |
|
| 3 | have been describe in | 64 |
|
| 4 | has been describe in | 48 |
|
| 5 | had been describe in | 7 |
|
