| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period [subord] | 43 |
|
| 2 | [prep] a longer [noun] [subord] | 25 |
|
| 3 | [prep] a longer [noun sg] [subord] | 25 |
|
| 4 | [prep] a [adj -er] period [subord] | 18 |
|
| 5 | [prep] a longer period [conj] | 15 |
|
| 6 | [prep] a long period [subord] | 12 |
|
| 7 | [prep] a longer period [subord] | 12 |
|
| 8 | [prep] [art] longer period [subord] | 12 |
|
| 9 | [prep] a longer period [subord] | 12 |
|
| 10 | [prep] a longer period [subord] | 12 |
|
| 11 | [prep] [art] longer period [subord] | 12 |
|
