| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of [noun sg] | 123 |
|
| 2 | [prep] a long period of [noun sg] | 112 |
|
| 3 | [prep] a long period of time | 98 |
|
| 4 | over a long period of [noun sg] | 78 |
|
| 5 | over a long period of [noun sg] | 78 |
|
| 6 | for a long period of [noun sg] | 20 |
|
| 7 | for a long period of [noun sg] | 20 |
|
| 8 | [prep] a longer period of [noun sg] | 11 |
|
| 9 | after a long period of [noun sg] | 9 |
|
| 10 | after a long period of [noun sg] | 9 |
|
