| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb past] a [adj] period [prep] | 48 |
|
| 2 | [vb past] a [adj] period [prep] | 44 |
|
| 3 | [vb past] a [adj] period [prep] | 43 |
|
| 4 | [vb past] a [adj] period of | 39 |
|
| 5 | [vb past] a [adj] period of | 39 |
|
| 6 | [vb past] a brief period [prep] | 9 |
|
| 7 | followed a [adj] period [prep] | 8 |
|
| 8 | [vb past] a brief period [prep] | 8 |
|
| 9 | [vb past] a long period [prep] | 6 |
|
| 10 | [vb past] a long period [prep] | 6 |
|
| 11 | [vb past] a [adj] period in | 5 |
|
| 12 | [vb past] a [adj] period in | 5 |
|
| 13 | [vb past] an [adj] period [prep] | 5 |
|
