| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | be once thought to be | 8 |
|
| 2 | [was/were] once thought to be | 8 |
|
| 3 | [be] once thought to be | 8 |
|
| 4 | was once thought to be | 5 |
|
| 5 | once thought to be [art] | 7 |
|
| 6 | once thought to be [art] | 7 |
|
