| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a period [prep] [art] | 89 |
|
| 2 | [prep] a period [prep] [art] | 89 |
|
| 3 | [prep] a period [prep] a | 49 |
|
| 4 | [prep] a period of [art] | 41 |
|
| 5 | [prep] a period [prep] the | 37 |
|
| 6 | for a period [prep] [art] | 29 |
|
| 7 | over a period [prep] [art] | 29 |
|
| 8 | over a period [prep] [art] | 29 |
|
| 9 | for a period [prep] [art] | 29 |
|
| 10 | [prep] a period in [art] | 20 |
|
| 11 | after a period [prep] [art] | 11 |
|
| 12 | after a period [prep] [art] | 11 |
|
| 13 | [prep] a period after [art] | 5 |
|
| 14 | [prep] a period at [art] | 5 |
|
