| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a [adj] period [prep] | 223 |
|
| 2 | [noun sg] [prep] a long period [prep] | 67 |
|
| 3 | [noun sg] [prep] a longer [noun] [prep] | 15 |
|
| 4 | [noun sg] [prep] a longer [noun sg] [prep] | 15 |
|
| 5 | [noun sg] [prep] a [adj -er] period [prep] | 13 |
|
| 6 | [noun] [prep] a longer period [prep] | 10 |
|
| 7 | [noun sg] [prep] a longer period [prep] | 9 |
|
| 8 | [noun sg] [prep] a longer period [prep] | 9 |
|
| 9 | [noun sg] [prep] [art] longer period [prep] | 9 |
|
| 10 | [noun sg] [prep] a longer period [prep] | 9 |
|
| 11 | [noun sg] [prep] a longer period [prep] | 9 |
|
| 12 | [noun sg] [prep] [art] longer period [prep] | 9 |
|
