| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] [adj] years | 357 |
|
| 2 | period [prep] [num] years | 335 |
|
| 3 | [noun] [prep] eight years | 135 |
|
| 4 | period [prep] eight [noun] | 12 |
|
| 5 | period [prep] eight [noun pl] | 11 |
|
| 6 | period [prep] eight year | 5 |
|
| 7 | period [prep] eight years | 5 |
|
