| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] [noun] [prep] an [adj] period | 31 |
|
| 2 | [adj] [noun sg] [prep] an [adj] period | 15 |
|
| 3 | [adj] [noun pl] [prep] an [adj] period | 15 |
|
| 4 | [adj] [prep] an [adj] period [prep] | 5 |
|
| 5 | [adj] [prep] an [adj] period of | 5 |
|
| 6 | [adj] [prep] an [adj] period of | 5 |
|
| 7 | [adj] [prep] an [adj] period [prep] | 5 |
|
