| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reference may [adv] be [vb pp] to | 5 |
|
| 2 | reference may [adv] be make to | 5 |
|
| 3 | reference may [adv] be [verb] to | 5 |
|
| 4 | reference may [adv] be made to | 5 |
|
