| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | within a [adj] period [prep] [noun] | 21 |
|
| 2 | within a [adj] period [prep] [noun] | 21 |
|
| 3 | within a short period [prep] [noun] | 7 |
|
| 4 | within a short period [prep] [noun] | 7 |
|
| 5 | within a period [prep] [adj] [noun] | 34 |
|
| 6 | within a period [prep] [num] [noun] | 33 |
|
| 7 | within a period [prep] three [noun] | 7 |
|
| 8 | within a period [prep] three [noun] | 7 |
|
