| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] main reason | 487 |
|
| 2 | the main reason | 478 |
|
| 3 | [art] main reason | 344 |
|
| 4 | [art] main reasons | 143 |
|
| 5 | a main reason | 9 |
|
