| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] to have been used [prep] | 17 |
|
| 2 | [vb pp] to have been used for | 6 |
|
| 3 | [vb pp] to have been used for | 6 |
|
| 4 | [vb pp] to have been used in | 5 |
|
| 5 | [vb pp] to have been used by | 5 |
|
| 6 | thought to have been used [prep] | 5 |
|
| 7 | [vb pp] to have been used by | 5 |
|
| 8 | [vb pp] to have been used in | 5 |
|
