| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of | 152 |
|
| 2 | [prep] [art] long period of | 150 |
|
| 3 | over [art] long period of | 85 |
|
| 4 | for [art] long period of | 23 |
|
| 5 | after [art] long period of | 18 |
|
| 6 | [prep] the long period of | 16 |
|
| 7 | of [art] long period of | 14 |
|
| 8 | [prep] [art] longer period of | 12 |
|
| 9 | during [art] long period of | 10 |
|
| 10 | [prep] [art] longest period of | 6 |
|
| 11 | to [art] long period of | 5 |
|
