| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [art] extent to [Wh det] | 99 |
|
| 2 | is [art] extent to which | 99 |
|
| 3 | is the extent to [pron] | 99 |
|
| 4 | is [art] extent to which | 99 |
|
