| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | was [prep] [det] period | 37 |
|
| 2 | was [prep] this period | 34 |
|
| 3 | was [prep] this period | 34 |
|
| 4 | was during [adj] period | 20 |
|
| 5 | was in [adj] period | 9 |
|
| 6 | was at [adj] period | 5 |
|
