| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] not been used [prep] [adj] | 6 |
|
| 2 | has not [be] used [prep] [adj] | 6 |
|
| 3 | [vb -s] not be used [prep] [adj] | 6 |
|
| 4 | [vb -s] not [been] used [prep] [adj] | 6 |
|
