| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of [noun] | 127 |
|
| 2 | [prep] a long period of [noun sg] | 123 |
|
| 3 | [prep] a long period of [noun] | 116 |
|
| 4 | [prep] a long period of time | 98 |
|
| 5 | [prep] a long period of time | 98 |
|
| 6 | over a long period of [noun] | 81 |
|
| 7 | over a long period of [noun] | 81 |
|
| 8 | for a long period of [noun] | 20 |
|
| 9 | for a long period of [noun] | 20 |
|
| 10 | [prep] a longer period of [noun] | 11 |
|
| 11 | after a long period of [noun] | 10 |
|
| 12 | after a long period of [noun] | 10 |
|
