| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a [adj] period of | 57 |
|
| 2 | [adv] [prep] a long [noun] of | 39 |
|
| 3 | [adv] [prep] a long [noun sg] of | 36 |
|
| 4 | [adv] [prep] a long period [prep] | 16 |
|
| 5 | [adv] [prep] a long period [prep] | 16 |
|
| 6 | [adv] [prep] a long period of | 15 |
|
| 7 | [adv] [prep] a long period of | 15 |
|
| 8 | [adv] [prep] a long period of | 15 |
|
| 9 | [adv] [prep] [art] long period of | 15 |
|
| 10 | [adv] [prep] [art] long period of | 15 |
|
