| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | reference [is] made [prep] [adj] | 6 |
|
| 2 | reference [is] make [prep] [adj] | 6 |
|
| 3 | reference [is] [vb pp] [prep] [adj] | 6 |
|
| 4 | reference [is] [verb] to [adj] | 6 |
|
| 5 | reference is [verb] [prep] [adj] | 6 |
|
