| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] been used for [noun sg] | 12 |
|
| 2 | been used for a [noun sg] | 10 |
|
| 3 | [vb -s] been used for a | 9 |
|
| 4 | [vb -s] been for a [noun sg] | 5 |
|
