| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adv] [adj] period of | 87 |
|
| 2 | a [adv] long [noun] of | 43 |
|
| 3 | a [adv] long [noun sg] of | 40 |
|
| 4 | [art] [adv] long period of | 23 |
|
| 5 | [art] [adv] long period of | 23 |
|
| 6 | a [adv] long period [prep] | 19 |
|
| 7 | a [adv] long period [prep] | 19 |
|
| 8 | a [adv] long period of | 18 |
|
| 9 | a [adv] long period of | 17 |
|
| 10 | a [adv] long period of | 17 |
|
