| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] period | 11387 |
|
| 2 | longer [noun] | 2194 |
|
| 3 | longer [noun sg] | 1556 |
|
| 4 | long period | 673 |
|
| 5 | [adj -er] period | 386 |
|
| 6 | longer period | 250 |
|
