| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a short period [prep] [noun sg] | 76 |
|
| 2 | [adv] short period [prep] [noun sg] | 47 |
|
| 3 | [adv] a period [prep] [noun sg] | 37 |
|
| 4 | [adv] a short period [prep] | 12 |
|
