| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [prep] a [adj] period | 519 |
|
| 2 | [noun sg] [prep] a long period | 129 |
|
| 3 | [noun sg] [prep] a longer [noun] | 67 |
|
| 4 | [noun sg] [prep] a longer [noun sg] | 67 |
|
| 5 | [noun sg] [prep] a [adj -er] period | 43 |
|
| 6 | [noun] [prep] a longer period | 40 |
|
| 7 | [noun sg] [prep] [art] longer period | 28 |
|
| 8 | [noun sg] [prep] [art] longer period | 28 |
|
| 9 | [noun sg] [prep] a longer period | 27 |
|
| 10 | [noun sg] [prep] a longer period | 27 |
|
