| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb -s] [prep] the [adj] period | 31 |
|
| 2 | [vb -s] [prep] a [adj] period | 15 |
|
| 3 | [vb -s] from [art] [adj] period | 7 |
|
| 4 | [vb -s] in [art] [adj] period | 7 |
|
| 5 | dates [prep] [art] [adj] period | 6 |
|
| 6 | [vb -s] to [art] [adj] period | 6 |
|
| 7 | [vb -s] for [art] [adj] period | 6 |
|
