| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb mod] once have [been] [art] [noun] | 13 |
|
| 2 | [modal v] once have [been] [art] [noun] | 13 |
|
| 3 | must once have [been] [art] [noun] | 6 |
|
| 4 | must once have [been] [art] [noun] | 6 |
|
| 5 | once have [been] [art] [noun] [prep] | 8 |
|
| 6 | once have [been] [art] [noun] [prep] | 8 |
|
| 7 | once have [been] [art] [noun] of | 6 |
|
| 8 | once have [been] [art] [noun] of | 6 |
|
