| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] be placed under | 15 |
|
| 2 | [vb past] been placed under | 14 |
|
| 3 | [vb past] [been] placed under | 14 |
|
| 4 | had [be] placed under | 13 |
|
