| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period [prep] [adj] year | 390 |
|
| 2 | period [prep] [num] year | 364 |
|
| 3 | [noun] [prep] ten year | 339 |
|
| 4 | period [prep] ten [noun] | 26 |
|
| 5 | period [prep] ten year | 18 |
|
| 6 | period [prep] ten year | 18 |
|
