| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] may be used [prep] an | 10 |
|
| 2 | [noun] may be used [prep] an | 10 |
|
| 3 | may be used [prep] an [noun sg] | 10 |
|
| 4 | may be used [prep] an [noun] | 10 |
|
