| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period of | 544 |
|
| 2 | [prep] a [adj] period of | 514 |
|
| 3 | [prep] a long [noun] of | 507 |
|
| 4 | [prep] a long [noun sg] of | 470 |
|
| 5 | [prep] a long period [prep] | 162 |
|
| 6 | [prep] a long period [prep] | 162 |
|
| 7 | [prep] a long period of | 152 |
|
| 8 | [prep] [art] long period of | 150 |
|
| 9 | [prep] [art] long period of | 150 |
|
| 10 | [prep] a long period of | 140 |
|
| 11 | [prep] a long period of | 140 |
|
| 12 | [prep] a long period of | 140 |
|
