| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adv] [adj] period of | 57 |
|
| 2 | [prep] a [adv] long [noun] of | 19 |
|
| 3 | [prep] a [adv] long [noun sg] of | 18 |
|
| 4 | [prep] a [adv] long period [prep] | 12 |
|
| 5 | [prep] [art] [adv] long period of | 12 |
|
| 6 | [prep] [art] [adv] long period of | 12 |
|
| 7 | [prep] a [adv] long period of | 12 |
|
| 8 | [prep] a [adv] long period [prep] | 12 |
|
| 9 | [prep] a [adv] long period of | 11 |
|
| 10 | [prep] a [adv] long period of | 11 |
|
| 11 | [prep] a [adv] long period of | 11 |
|
