| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period of | 1599 |
|
| 2 | [prep] a period of | 1599 |
|
| 3 | within a [noun] of | 725 |
|
| 4 | within a [noun sg] of | 716 |
|
| 5 | within [art] period of | 70 |
|
| 6 | within [art] period of | 70 |
|
| 7 | within a period [prep] | 48 |
|
| 8 | within a period [prep] | 48 |
|
| 9 | within a period of | 47 |
|
| 10 | within a period of | 47 |
|
| 11 | within a period of | 47 |
|
| 12 | within a period of | 47 |
|
