| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period of | 954 |
|
| 2 | a short [noun] of | 510 |
|
| 3 | a short [noun sg] of | 505 |
|
| 4 | a short period [prep] | 133 |
|
| 5 | a short period [prep] | 133 |
|
| 6 | [art] short period of | 105 |
|
| 7 | a short period of | 91 |
|
| 8 | a short period of | 91 |
|
