| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an [adv] [adj] period | 18 |
|
| 2 | [prep] an [adv] [adj] period | 18 |
|
| 3 | through an [adv] [adj] period | 5 |
|
| 4 | through an [adv] [adj] period | 5 |
|
| 5 | an [adv] [adj] period [prep] | 16 |
|
| 6 | an [adv] [adj] period [prep] | 16 |
|
| 7 | an [adv] [adj] period of | 7 |
|
| 8 | an [adv] [adj] period of | 7 |
|
