| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adv] [prep] a [adj] period of | 57 |
|
| 2 | [adv] [prep] a short [noun] of | 23 |
|
| 3 | [adv] [prep] a short [noun sg] of | 22 |
|
| 4 | [adv] [prep] a short period [prep] | 14 |
|
| 5 | [adv] [prep] [art] short period of | 9 |
|
| 6 | [adv] [prep] [art] short period of | 9 |
|
| 7 | [adv] [prep] a short period of | 8 |
|
| 8 | [adv] [prep] a short period of | 8 |
|
| 9 | [adv] [prep] a short period of | 8 |
|
