| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] an [adj] period of | 29 |
|
| 2 | [noun sg] [prep] an [adj] period of | 20 |
|
| 3 | [verb] [prep] an [adj] period of | 16 |
|
| 4 | [vb pp] [prep] an [adj] period of | 9 |
|
| 5 | [adv] [prep] an [adj] period of | 6 |
|
| 6 | [adj] [prep] an [adj] period of | 5 |
|
| 7 | [noun pl] [prep] an [adj] period of | 5 |
|
| 8 | [prep] an [adj] period of [adj] | 33 |
|
| 9 | [prep] an [adj] period of [noun] | 30 |
|
| 10 | [prep] an [adj] period of [noun sg] | 29 |
|
| 11 | [prep] an [adj] period of [num] | 25 |
|
| 12 | [prep] an [adj] period of time | 14 |
|
| 13 | [prep] an [adj] period of time | 14 |
|
| 14 | [prep] an [adj] period of [adj] | 8 |
|
| 15 | [prep] an [adj] period of two | 5 |
|
| 16 | [prep] an [adj] period of two | 5 |
|
