| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period | 2494 |
|
| 2 | a longer [noun] | 520 |
|
| 3 | a long period | 519 |
|
| 4 | a longer [noun sg] | 514 |
|
| 5 | a [adj -er] period | 198 |
|
| 6 | [art] longer period | 119 |
|
| 7 | [art] longer period | 119 |
|
| 8 | a longer period | 114 |
|
| 9 | a longer period | 114 |
|
