| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a long period [conj] | 10 |
|
| 2 | [noun sg] [prep] a long period [conj] | 8 |
|
| 3 | [noun] [prep] a longer period [conj] | 7 |
|
| 4 | [noun] over a long period [conj] | 7 |
|
| 5 | [noun] over a long period [conj] | 7 |
|
| 6 | [noun] [prep] a long period [subord] | 5 |
|
| 7 | [noun] [prep] a long period than | 5 |
|
| 8 | [noun] [prep] a long period than | 5 |
|
