| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | by referring to | 112 |
|
| 2 | of referring to | 39 |
|
| 3 | in referring to | 27 |
|
| 4 | after referring to | 17 |
|
| 5 | for referring to | 11 |
|
| 6 | without referring to | 9 |
|
