| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] which point | 28 |
|
| 2 | [prep] which point | 22 |
|
| 3 | at which point | 20 |
|
| 4 | at which point | 20 |
|
| 5 | [prep] which points | 6 |
|
