| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] | 1753 |
|
| 2 | [prep] a period [prep] | 1753 |
|
| 3 | [prep] a period of | 1599 |
|
| 4 | [prep] a period of | 1599 |
|
| 5 | over a period [prep] | 628 |
|
| 6 | over a period [prep] | 628 |
|
| 7 | for a period [prep] | 389 |
|
| 8 | for a period [prep] | 389 |
|
| 9 | after a period [prep] | 154 |
|
| 10 | after a period [prep] | 154 |
|
| 11 | in a period [prep] | 126 |
|
| 12 | in a period [prep] | 126 |
|
| 13 | during a period [prep] | 83 |
|
| 14 | during a period [prep] | 83 |
|
| 15 | [prep] a period in | 72 |
|
| 16 | [prep] a period in | 72 |
|
| 17 | of a period [prep] | 52 |
|
| 18 | of a period [prep] | 52 |
|
| 19 | to a period [prep] | 48 |
|
| 20 | through a period [prep] | 48 |
|
| 21 | through a period [prep] | 48 |
|
| 22 | within a period [prep] | 48 |
|
| 23 | to a period [prep] | 48 |
|
| 24 | within a period [prep] | 48 |
|
| 25 | with a period [prep] | 44 |
|
| 26 | with a period [prep] | 44 |
|
| 27 | by a period [prep] | 37 |
|
| 28 | by a period [prep] | 37 |
|
| 29 | as a period [prep] | 34 |
|
| 30 | as a period [prep] | 34 |
|
