| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [be] [adv] a [adj] of | 111 |
|
| 2 | [adv] a [adj] period of | 42 |
|
| 3 | [be] a [adj] period of | 34 |
|
| 4 | [be] [adv] a period of | 17 |
|
| 5 | [be] [adv] a [adj] period | 11 |
|
