| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] [noun sg] | 670 |
|
| 2 | in a period [prep] [noun sg] | 38 |
|
| 3 | in [adj] period [prep] [noun sg] | 37 |
|
| 4 | in a [adj] period [prep] | 36 |
|
| 5 | in a [adj] [prep] [noun sg] | 19 |
|
