| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] long period of time | 100 |
|
| 2 | [prep] [art] long period of time | 100 |
|
| 3 | [prep] [art] long period of time | 100 |
|
| 4 | [prep] a long period of time | 98 |
|
| 5 | [prep] a long period of time | 98 |
|
| 6 | [prep] [art] long period of time | 88 |
|
| 7 | over [art] long period of time | 77 |
|
| 8 | over [art] long period of time | 77 |
|
| 9 | for [art] long period of time | 19 |
|
| 10 | for [art] long period of time | 19 |
|
| 11 | [prep] [art] longer period of time | 10 |
|
