| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | year [prep] the period | 18 |
|
| 2 | years [prep] the period | 12 |
|
| 3 | year [prep] the period | 6 |
|
| 4 | year of the period | 5 |
|
| 5 | year of the period | 5 |
|
