| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period [prep] | 179 |
|
| 2 | [prep] a long period [prep] | 162 |
|
| 3 | [prep] a long period of | 152 |
|
| 4 | over a long period [prep] | 93 |
|
| 5 | over a long period [prep] | 93 |
|
| 6 | for a long period [prep] | 33 |
|
| 7 | for a long period [prep] | 33 |
|
| 8 | after a long period [prep] | 19 |
|
| 9 | after a long period [prep] | 19 |
|
| 10 | [prep] a longer period [prep] | 17 |
|
| 11 | of a long period [prep] | 11 |
|
| 12 | of a long period [prep] | 11 |
|
| 13 | from a long period [prep] | 5 |
|
| 14 | from a long period [prep] | 5 |
|
| 15 | to a long period [prep] | 5 |
|
| 16 | during a long period [prep] | 5 |
|
| 17 | to a long period [prep] | 5 |
|
| 18 | [prep] a long period during | 5 |
|
| 19 | [prep] a long period in | 5 |
|
| 20 | during a long period [prep] | 5 |
|
