| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of [noun sg] | 112 |
|
| 2 | [prep] a long period of [noun sg] | 112 |
|
| 3 | [prep] a long period of time | 88 |
|
| 4 | over a long period of [noun sg] | 72 |
|
| 5 | over a long period of [noun sg] | 72 |
|
| 6 | for a long period of [noun sg] | 17 |
|
| 7 | for a long period of [noun sg] | 17 |
|
| 8 | after a long period of [noun sg] | 9 |
|
| 9 | after a long period of [noun sg] | 9 |
|
