| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] within a period of | 19 |
|
| 2 | [vb pp] within a period of | 17 |
|
| 3 | [noun] within a period of | 15 |
|
| 4 | [noun sg] within a period of | 11 |
|
| 5 | within a [adj] period of | 24 |
|
| 6 | within a [adj] period of | 24 |
|
| 7 | within a short period of | 7 |
|
| 8 | within a short period of | 7 |
|
| 9 | within a period of [adj] | 34 |
|
| 10 | within a period of [num] | 33 |
|
| 11 | within a period of three | 7 |
|
| 12 | within a period of three | 7 |
|
| 13 | within a period of [noun] | 5 |
|
| 14 | within a period of [noun sg] | 5 |
|
