| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] [art] | 131 |
|
| 2 | [was/were] a [adj] [prep] [art] | 31 |
|
| 3 | [was/were] a [adj] period [prep] | 20 |
|
| 4 | [was/were] a period [prep] [art] | 5 |
|
