| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] of [adj] years [unc] duration | 48 |
|
| 2 | be of [adj] years [unc] duration | 48 |
|
| 3 | [is] of [adj] years [unc] duration | 44 |
|
| 4 | is of [adj] years [unc] duration | 44 |
|
