| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] [adj] period of | 36 |
|
| 2 | [adv] [prep] [adj] period of | 22 |
|
| 3 | [adv] [prep] long [noun] of | 17 |
|
| 4 | [adv] [prep] long period of | 11 |
|
| 5 | [adv] [prep] long period [prep] | 9 |
|
| 6 | [adv] [prep] long period of | 9 |
|
| 7 | [adv] [prep] long period [prep] | 9 |
|
| 8 | [adv] [prep] long period of | 8 |
|
