| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | on a [noun] | 24070 |
|
| 2 | on a [noun sg] | 21593 |
|
| 3 | [prep] a period | 2137 |
|
| 4 | [prep] a period | 2137 |
|
| 5 | on [art] period | 50 |
|
| 6 | on [art] period | 50 |
|
| 7 | on a period | 13 |
|
| 8 | on a period | 13 |
|
| 9 | on a period | 13 |
|
