| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reference is [vb pp] [prep] [adj] | 6 |
|
| 2 | reference [is] [vb pp] to [adj] | 6 |
|
| 3 | reference [is] [vb pp] [prep] [adj] | 6 |
|
| 4 | reference [is] made [prep] [adj] | 6 |
|
