| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | at a [noun] of | 2709 |
|
| 2 | at a [noun sg] of | 2676 |
|
| 3 | [prep] a period of | 1599 |
|
| 4 | [prep] a period of | 1599 |
|
| 5 | at [art] period of | 10 |
|
| 6 | at [art] period of | 10 |
|
| 7 | at a period [prep] | 7 |
|
| 8 | at a period [prep] | 7 |
|
| 9 | at a period of | 5 |
|
| 10 | at a period of | 5 |
|
| 11 | at a period of | 5 |
|
| 12 | at a period of | 5 |
|
