| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | may be [vb pp] at the [noun sg] | 48 |
|
| 2 | may be [vb pp] at a [noun sg] | 11 |
|
| 3 | may be made at [art] [noun sg] | 7 |
|
| 4 | may be used at [art] [noun sg] | 6 |
|
| 5 | may be [vb pp] at [art] time | 5 |
|
| 6 | may be [vb pp] at [art] discretion | 5 |
|
