| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period [prep] [noun] | 134 |
|
| 2 | [prep] a long period [prep] [noun sg] | 128 |
|
| 3 | [prep] a long period of [noun] | 127 |
|
| 4 | [prep] a long period [prep] [noun] | 122 |
|
| 5 | [prep] a long period [prep] time | 98 |
|
| 6 | [prep] a long period [prep] time | 98 |
|
| 7 | over a long period [prep] [noun] | 84 |
|
| 8 | over a long period [prep] [noun] | 84 |
|
| 9 | for a long period [prep] [noun] | 23 |
|
| 10 | for a long period [prep] [noun] | 23 |
|
| 11 | [prep] a longer period [prep] [noun] | 12 |
|
| 12 | after a long period [prep] [noun] | 11 |
|
| 13 | after a long period [prep] [noun] | 11 |
|
